We have stayed at all 4 mod's more than once - Here are our reviews on each
CBR - Great themed pool and kids pool area, Great Pool Bar, food court will more than meet your needs food was hot and service was great. Rooms are comfortable and the themeing is great, who does not love Pirates

, ?The grounds are just beautiful. There is
alot of walking here very large resort, But there are bus stops within each island, and an internal bus. This resort does not share buses with other resorts. No elevators. We never had a problem with mousekeeping in all our stays, and did receive towel animals almost every stay, everyday, overall cleaning was good
CS - Great themed pool, large resort so lots of walking and it has a convention feel is some of the rooms, not so much that Disney feel. Rooms are comfortable. Food Court was okay, there offerings were not really to our liking, we only stop for breakfast once, the rest for snacks in the evening. There are elevators. Mousekeeping was spotty, I think that they changed mousekeeper on us mid stay. As the first few days were not good and then the last part of the trip it was great. No towel animals here not at any stay. Buses service was just okay
POR - Great themed pool and playground, alot of walking but we feel not as much as at CBR and CS, Food court very good, had several meals breakfast and lunch no complaints. Boat to DTD nice way to travel. There are times that you share a bus with POFQ. Bus service was good not long wait times. We were on the 1st floor here and I can not remember if I saw elevators, I think that there are, just not positive. You can walk to POFQ, nice walk especially early in the am. Rooms are comfortable and quite, mousekeeping was good, a few towel animals not daily. Grounds are beautiful and well kept.
POFQ - This is the smallest of the mod's, themed pool great and hot tub is in a strange place. Rooms comfortable and quite. The river view room are great, nice and peaceful after a day in the parks. Food court is small, but offerings are to our liking, never any issue, food hot and good service . This resort shares a bus at times with POR, bus wait time okay. Mousekeeping here we feel is the best, not alot of towel animals, but the rooms were very clean on each of our stay's here. Not as much walking in my opinion. There are elevators.
Each of the mod's has something special to offer. Check out allears.com they have alot of pictures of the resorts. This might help you make a choice.