Being that I'm in the US of A, I don't have a helluvalot of choices. The sites I played:
1)
Seals With Clubs
a) Advantages: works with
linux systems. Best performance with
Opera
Games are soft.
b) Disadvantages: The A Number One disadvantage is that this is a Bitcoin site. All chips are 1/1000000 of a Bitcoin. This means you're
gambling twice: on your cards, and on the value of Bitcoin, which is
extremely volatile. You can lose value when Bitcoin heads south faster than you can win. (I cashed out twice when Bitcoin took off.)
Other disadvantage: action tends to be rather slow, especially for higher stakes.
2)
Ignition
a) Advantages: Site works well with Linux. Best with the Chromium browser (I use the un-Googled version)
Games tend to be soft. Good volume of players.
b) Disadvantages: Anonymous site: you can't track players.
I've tried other sites that I didn't particularly like. Black Chip Poker: requires client that only runs on Win-d'ohs and the Mac. Lots of software malfunctions. Bovada: went from browser playable to requiring a client. Carbon: burned this site out. Limited traffic, lots of regulars who stopped playing me.