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Specifically for teenagers it may be important to work out in both aerobic and anaerobic workouts. So, this would be another reason to favor the combined over the other regimen.

You will probably have overheard the "knowledgeable" trainers at the gym tell their credulous clients, who just told them they "want to lose that belly fat", that the best thing they could do was to "stop spending that much time with weight training" and to do some more (steady state) cardio. Well, in general, there's nothing wrong about steady state cardio - in fact, many studies show that it is superior to resistance training when it comes to "merely" shedding body weight (in the obese). If "weight loss" is still everything you're aspiring, though, you are either new to the waredownloadsoft or another of the "headline skimmers" who happen to ask questions that are answered not just in the article, but actually in one of the red boxes... ah, I am digressing.

So, what I actually wanted to tell you is that a recent study from the Universities of Ottawa and Calgary (Alberta. 2015), clearly contradicts the average commercial gym chain trainer's recommendation and shows that belly fat loss is better achieved with diet + resistance training.
The subjects of the study were youngsters, 304 (! the high number of participants is a huge plus of the study) 14-18 year-old overweight and obese teenagers (mean body fat almost 50%!), to be specific, who were randomized to four different treatments for 22 weeks:

Table 1: Training progression in the Aerobic and Resistance group (Alberga. 2015)

• aerobic training (Aerobic), 
• resistance training (Resistance),
• combined aerobic + resistance training (Combined) or 
• non-exercising control group (Control)

Adolescents,... ok, but unless they're too sarcopenic (=suffer from pronounced age-induced muscle loss) to hit the weights, your overweight clients or you, yourself, should be able to follow the same training programs the adolescents did and see similar results if you fully adhere to the following training prescriptions:

• Resistance: The duration of each session progressed to a maximum of about 45 min. Exercises were primarily performed on weight machines, and when required with dumbbells (lateral raise, shrugs, bicep curls, front raise, preacher curl, dumbbell pullover) or by using one's own body weight as resistance (lunges, sit-ups and abdominal crunches).
  

  Table 2: Overview of the individual workouts in the Resistance group (Alberga. 2015).

  Participants alternated among exercises from groups A1, A2, B1 and B2 shown in Table 2. Participants were asked to rest for ~ 2 min between sets and were instructed on proper breathing techniques.
• Aerobic: Participants randomized to the aerobic training group underwent a 22-week program (Table 1, left) wherein the exercise intensity and duration increased progressively to a maximum of 45 min per session. Exercise was performed on a cycle ergometer, elliptical or treadmill and participants were free to vary the machine(s) used. Exercise intensity was standardized using heart rate monitors (Polar Electro Oy, Kempele, Finland).
• Combined: This group performed the full exercise programs done by both the aerobic and resistance training groups (Table 1, left + right) during each session for a total of 4 times per week for a maximum of 90 min per session.

Figure 1: Changes in subcutaneous (SAT) and visceral (VAT) body fat at different regions; L4L5 represents area between 4th and 5th Lumbar vertebrae; * indicates sign. difference to control; # sign. difference to aerobic (Alberga. 2015).

References:

• Alberga, A. S., et al. "Effects of aerobic and resistance training on abdominal fat, apolipoproteins and high-sensitivity C-reactive protein in adolescents with obesity: the HEARTY randomized clinical trial." International journal of obesity (2005) (2015).
• Dansinger, Michael L., et al. "Comparison of the Atkins, Ornish, Weight Watchers, and Zone diets for weight loss and heart disease risk reduction: a randomized trial." Jama 293.1 (2005): 43-53.
• Thompson, A., and J. Danesh. "Associations between apolipoprotein B, apolipoprotein AI, the apolipoprotein B/AI ratio and coronary heart disease: a literature‐based meta‐analysis of prospective studies." Journal of internal medicine 259.5 (2006): 481-492.
• Walldius, G., and I. Jungner. "The apoB/apoA‐I ratio: a strong, new risk factor for cardiovascular disease and a target for lipid‐lowering therapy–a review of the evidence." Journal of internal medicine 259.5 (2006): 493-519.

This could have been the HP breakfast. Egg-based pancakes + ham.

It is almost like the question "to carb" or "not to carb" and the almost religiously maddish discussions between carb-eaters and ketophiles: The debate revolving around the useful- or uselessness of breakfast, when it comes to health and physique issues.

In my more recent articles about the topic I have repeatedly exposed the claim that "not having breakfast is bad for everyone" is total bogus; and while I am not going to go back on that I am about to discuss a study that demonstrates that the right breakfast, i.e. one that's high in protein, may be extremely better than having no breakfast at all.
Said study has been conducted by scientists from the University of Missouri and the Purdue University (Leidy. 2015). It's an investigation into the effects of normal-protein (NP) vs. high-protein (HP) breakfast meals on appetite control, food intake, and body composition in “breakfast skipping” young people with overweight/obesity.

As a waredownloadsoft reader you'll know that previous studies suggest that as habitual breakfast skippers, the youths are actually not the ideal study object for a study to show beneficial effects of breakfast. After all, a recent study by Thomas et al. showed quite convincingly that "Whether Skipping Breakfast Increases Insulin, Hunger and Blood Lipids Depends on One's Breakfast Habits" (read the article). Is this a problem? Well, it could be if the new study yielded negative results. After all, we'd have to argue that this was to be expected if the subjects were habitual breakfast skippers.

Table 1: Subject characteristics at baseline (Leidy. 2015). As you can see the subjects were randomly assigned to the three groups at a ratio of 1:2:2 to breakfast skipping, normal protein (NP) and high protein (HP) breakfast.

Luckily, the results were positive and the study with its 12-week study period probably long enough to overcome the effects of habituation which mess with the results of all studies which test the effect of having vs. skipping breakfast on only one or two occasions.

Figure 1: Macronutrient composition (g) of the test meals used in the study (Leidy. 2015)

The study at hand, however, had its fifty-seven adolescent subjects (age: 19 +/- years; BMI: 29.7 +/- 4.6 kg/m²) complete a 12-week randomized controlled trial in which the adolescents consumed either a 1,464 kJ NP breakfast (13 g protein), an isocaloric breakfast with a high protein content (HP | 35 g protein), or continued to skip breakfast (CON). The main outcome variables were the subjects' pre- and post-study appetite, their food intake, body weight, and body composition, which was assessed assessed via DXA scans (which are as you know still the "gold standard" for measuring the body composition of subjects in scientific studies)
The NP and HP groups were provided with specific breakfast meals to consume between 6:00 and 9:45am each day, while the CON group continued to skip breakfast (with nothing to eat/drink, besides water) before 10:00am - with significant consequences as the in parts significant inter-group differences in Figure 2 can tell you.

Figure 2: Comparison of the changes in fat mass, the daily food intake, hunger and fullness ratings in the subjects from the CON (=kept skipping breakfast), NP (normal protein) and HP (high protein) breakfast groups (Leidy. 2015).

The superiority of (a) having breakfast and (b) consuming a high protein breakfast are not debatable. With its 12-week study duration, the study at hand obviously allowed for a full habituation and did thus - much in contrast to many short-term studies - yield all the benefits that are usually ascribed to having breakfast. In particular, having breakfast...

• "Breakfast!? An (Un-)Biased (?) Review of the Breakfast Myth" | read it!

  made the subjects magically lose (HP) or at least not gain (NP) superfluous body fat.
• significantly reduced the daily energy intake in the high protein condition and buffered the significant increase in energy intake in the no breakfast condition if the breakfast had a normal protein content,
• reduced the total time during which the subjects were hungry not just in the morning, but 24/7, and
• increased the subjects' fullness, especially in the morning.

• Dhurandhar, Emily J., et al. "The effectiveness of breakfast recommendations on weight loss: a randomized controlled trial." The American journal of clinical nutrition 100.2 (2014): 507-513.
• Leidy, Heather J., et al. "A high‐protein breakfast prevents body fat gain, through reductions in daily intake and hunger, in “Breakfast skipping” adolescents." Obesity (2015).
• Schlundt, David G., et al. "The role of breakfast in the treatment of obesity: a randomized clinical trial." The American journal of clinical nutrition 55.3 (1992): 645-651.
• Thomas, Elizabeth A., et al. "Usual breakfast eating habits affect response to breakfast skipping in overweight women." Obesity 23.4 (2015): 750-759.