Hey jo-
I like pilates very much, but for me it's not much of a weight-loss tool. It's great for abdominal/core strength, which helps the back and the posture. When I'm done with a pilates session, my abs feel strong (and burn), but I haven't broken a huge sweat or anything. Body-sculpting, on the other hand, is hard-core-sweat-like-a-pig sorta working out. When I'm done with that class, my muscles quiver, I'm drenched with sweat, and I'm out of breath. You'll definitely get your calories burnt with that class.
My advice...try as many different types of classes as you can. You never know what you really might like til you try it. And, keep a variety, so that your body never gets too used to doing one thing all the time.
Well, that's my two cents.
Good luck.
jen