I have played on a few over the years,
party poker
Full Tilt
PKR
888
Bet Fred
Euro sport Bet
Poker King
GG Poker
But I always return to my favorite site PokerStars, I really do not know what it is but I find them one of the best, and have had some of my biggest results on their site, Some of the other sites have too much going on in the Home Lobby Tab, I get lost, and cannot find the games I am looking for, others are too gimmicky, and the only thing I dislike on Pokerstars is the Throwables as I find them a little childish and are not really needed for playing.
As for time, I have plenty to spend now I am retired, so the hours of enjoyment I get from playing does not worry me, and as for money, I still have to make my first deposit on any site, I don't deposit my own money as that would be asking for trouble, and I do not like to gamble, all money I have in any of these sites is all from Free-rolls and to be honest I really do not care if they all went bust and I lost the lot, What you never had, You can never miss.
When the fun Stops, STOP!