I've stayed at all except FW. We continually go back to Riverside (I think we've stayed there 6 or 7 times now).
The grounds are beautiful. I personally prefer the mansions as they seem more majestic and sweeping. It's large, but I like that because it has plenty of winding paths to wander around, and it never really seemed crowded. I love that there is a boat to DTD so you aren't completely reliant on buses everywhere, and there is an area to rent bikes and watercraft, which we tend to do every trip. The food court is large and has plenty of options for anyone. We love to go back to the lounge to hear Bob play after a long day at the parks.
CSR would be my second choice, as the queen beds were nice to have and I liked the theme and the pool area. The "food court," Pepper Market was slightly better selection, but more expensive. It felt more removed from the rest of the parks and that bothered me. I've stayed here once.
FQ would be my 3rd choice. I've stayed here once. I like the boat ride to DTD, as stated, and the theme is nice. For me, it's too small and I find the entire resort just feels crowded because of that. I also was not a fan of the pool area here, and found the food court small and lacking in selection. Though you can get beignets!
CBR is my least favorite, but I still enjoy it. I have stayed here twice and the first time was horrible (our room smelled of smoke but they wouldn't move us and we had a longggg hike to the main building). The second time was much better. Walking around the resort is pleasant, but there isn't much shade. As with CSR, you only have bus transport here, and I felt pretty removed from the rest of WDW. The food court and pool are nice and didn't seem overcrowded, despite the size of the resort.
Hope that helps!
