Cumberlands are great tubes, not too pricey and holds its own against the higher end ones.
I own a caddis pro 2000:
Probably the lowest sitting vstyle tube there is. It pretty much means you are sitting a little below water level. Super light and packable.
Fat cat and odc 420:
Both great heavy duty tubes. Noticeably heavier than the c0umberland, these are tanks of the tube world. You sit pretty high and these generally hold a decent amount of weight as well. Draw back is they are heavy, sit higher in the water meaning you catch wind more. The lack of a "spreader bar" means if you under inflate your tube, you may have a taco effect going. The fish cat has an inflatable seat/backrest option and if you pop a bladder, the foam seating is more than boyant enough to act as an swim assist device to keep you afloat.
Pontoon style tube...still sits in water, drag sucks and the smaller valve for the back rest is strange to say the least. but, rolls up small and very packable