We have stayed on the older side multiple times and the newer side once. No problems. They are considered the "same" resort but as mentioned one is a newer phase. Its pretty much just across the street to each phase so is walking distance.
Their main pool which is a volcano pool with slide is on the older side, the turtle shape pool and kids pool is on the newer side along with a mini golf course. You can use everything on each side.
I think the location is great (across the street from an entrance to Disney and downtown Disney) and having all that space and a kitchen can save lots of $$$