I enjoy gambling on the Ballys floor because it's very big, have a lot of variety of table games and slots, and is a lot easier to breathe in there.
I've also stayed there once, and the room was so basic that it reminded me of Imperial Palace. Eep!
All in all, Ballys has a lot of other cool amenities that make it a definite stop on any Vegas trip:
-EveningCall frozen daquiri bar at the end of the casino
-Central location
-Low table limits
-Shuttle to Rio (which sometimes takes forever)
-Bar
-Oh, this bar is the best!!! $3 for a 20oz draft beer. And if you're playing at one of the video poker machines at the bar, your beer is absolutely free! What a great deal!