DH and I spend very little time at the resort, and it's just the two of us, so we usually stay at AS.
The prices (generally) can't be beat.
But that being said, we stayed at a mod last May because a mod was costing only $10 a night more than a regular room at ASMo.
So far, our best CM and bus service has been at the AS.
CSR is a very nice resort.. But it is *more spread out* than the AS resorts.
The perks for CSR are:
a little larger room (barely noticeable)
in room coffee maker
good food court (although more expensive than AS food court)
quiet resort
great pool and includes a large hot tub (spa in Disney-speak)
more to do at the resort (water mice, as an example)
We really enjoyed staying at ASMo. IF I was debating between the two, I would shoot for ASMo. BUT if CSR was another choice, and ASMo was not available, I would probably go with CSR. (Depending on the price dfference.)
We are staying at ASMu again because we got the $55 (with tax) night rate. That's pretty hard to beat. And with not being in the room or at the resort much anyway...
But if you plan on using the pool or being in your room a lot, CSR would be a good choice. Although your kids may find it boring. AS I doubt they would be bored at.