We have stayed at Pop, Movies, Sports, and most recently Port Orleans Riverside.
Riverside was beautiful, very peaceful, but I would stress what the other poster said about it being HUGE. There were 4 bus stops just for this one hotel. We had a nice location so that it wasn't too long of a walk to the food court or main bus stop. Guests staying way out by those far bus stops though, I wonder how often they walk to the food court, arcade, gift shop, etc. I like to be close enough to go back and forth.
It really depends on your family, age of children, etc. If you think you would take advantage of the bike rentals, fishing, boat rides, sit down restaurant, nature walks, boat to Downtown Disney, etc then POR is a great choice. The All Stars and POP are much more colorful and so much fun for young children. The theming is great at all of them, personal choice which is a favorite. I didn't notice too much difference between the bus services at the values and POR, although as mentioned POP doesn't share like the All Stars sometimes do.
You'll have a great time wherever you decide to stay. Let me know if you have any other questions.