I haven’t heard of a lot of those, but I’ve played a few.
UltimateBet was okay, but I didn’t play much.
PartyPoker I played quite a bit, but never deposited. The other players on there generally annoyed me. Most seemed like 20 year old guys that had had a couple too many beers that night…
PokerChamps is the only one I reinstalled after wiping my drive recently. I get a little tired of seeing Gus leering at me when I check my affiliate stats, but I like the software best from a player’s perspective.
Not sure if that helps any. I mostly play for fun…