Agree with F1Julie - for us the main advantage to CSR was the lack of people around in the daytime. Seems like many of the rooms are single people down for a convention which makes for a much quieter experience than all rooms full of families. Also these same people are in meetings all day which means the pool area is much emptier and the busses are completely empty. Just back from CSR & I think only once did we ride a bus with anyone else on it - certainly never had to stand, etc. Also you can have internet access and we had no trouble going to the business center and getting our boarding passes printed out for free. There's also a health club, if that makes a difference.
But I think the main difference was it had a more sophisticated, business, relaxing feel. PO I think has a more exciting, family, Disney feel. Personally, I love the quiet!
I will concede it was a HUGE resort. We were in the Casitas, near the main bus stop, but after the first day they closed that road for construction so we had to drive ALL the way around the Cabanas, Ranchos, and most of the Casitas to get to our parking area, then walk a long way to our room. With younger kids (mine are 9-12) it would probably have been a real hassle. We requested the top (4th) floor to avoid the problem of having people stampeding above us and got a strange glance - apparently not one of the things normally requested - guess most people want the first floor!