We're a family of 5, so we always do the Family Suites because we're not willing to take the chance that our request for connecting rooms won't be granted. Even though it's more expensive to stay at a suite than in a Moderate room that can fit 5, the 2 separate rooms, 2 bathrooms, and fridge/microwave make it worth it for us.
Our first trip we did a Cars Suite in AoA, and we loved it! Both beds for the kids seemed to be comfortable, and we liked having a full-size table because we ate breakfast in the room. (We also loved being able to close our door and have a little time away from the kids!) The kids were 7, 10, and 13 then.
For our next trip we've booked a suite at All Star Music. I'm not as excited about it--the theming just doesn't seem like as much fun. (My kids, who are now 9, 12, and 15, aren't bothered by that at all.) But with the price difference (I think it was about $100 per night the week we're going to be there) we couldn't justify AoA this trip. From what I've read, the sofa bed and pull out chair are fine but the pull out ottoman is uncomfortable for older, heavier kids. We're going to order a blow up bed as a back up, and if we need to use it the kids will rotate beds so that no one spends too many nights on the blow up bed. In theory a family of 5 can fit at ASMu without using the ottoman, but my kids don't like to share beds. Even when we were at AoA, they decided they'd rather switch off nights on a blow up bed than share either of the doubles.
Just thought of one more thing we liked better at AoA's suites vs. ASMu's. With AoA, one bathroom is in the small bedroom and the other is in the big room. At ASMu, I think both bathrooms are off the bigger room. When DH and I are getting ready for bed or showering late at night, we'll be more worried about waking the kids with the ASMu layout.