Well personally I like nitrogensports.
There is some benefits witch I like so they have me as player, only negative is there is not alot of players
I used to play on nitro like 4 years ago, every Wednesday they used to do a freeroll for 0.2BTC, the price of bitcoin was like $600 so it wasn't bad at all. I don't know if they keep doing this kind of tournament, but for sure they should have some nice promos.
If you are looking for a poker site with a nice amount of players I think SwC is the best option.