Jennifer,
I am a big fan of the Family Suites, and I think they will be a bit better than two connecting rooms for your family. Why do I think that? Well, the Family Suites at the
All Star Music Resort have a queen bed (2 adults), 1 twin sleeper (1 child or adult), 1 double sleeper sofa (2 children), and 1 twin sleeper ottoman (1 child). The sleepers may not be as comfortable as a traditional bed, but with teens and tweens in your party it is nice just to have more beds in general.
As an alternative, two connected rooms means four double beds, but no kitchenette. The doubles will be better than the fold out beds, so maybe a slight improvement for the one adult in a sleeper, but the two adults sharing a bed will find the queen in the Suite a huge improvement.
Beyond that, the kitchenette is a wonderfully helpful feature, and I think that while the overall square footage remains the same, you just feel like you have more space. That is crucial for a larger group like yours on vacation!
So either choice will do, but in your case the Family Suite is the way to go!
Have a magical vacation!