We have only stayed at CSR. The only other we have considered is POFQ. However, we are so happy at CSR, that we just haven't tried another (we will be at the CSR for the 7th time in September). It is a large resort, but with the girls and their age, I don't see that as being a problem. They will love the pool with the great slide; the hot tub, perhaps the spa/fitness center (massages available); the food court and even the quiet pools. There are hammocks scattered around the resort; a volleyball court; boat rentals, etc. Just so you know when making your decision, the CSR will be undergoing a rehab beginning in January. They will start at one end of the resort and work around for about a year. Our favorite area is the Casitas...we always stay in Casitas 4 or 5--close to the quiet pool and the spa. From those buildings it is a five minute walk to the main building and about a seven minute walk to the main pool.
I am sure whatever resort you decide on you will be happy.