PokerStars is the worlds largest poker site by far. In our opinion it is also the best. The only thing that is not so great is that the competition in general is tougher than on other sites and that can of course be a major issue. If weak competition is high on your wanted list we recommend PartyPoker as the number one choice, see below.
Pokerstars also has the best software for playing on mobile devices.
BetOnline accepts US players!
Out of the few sites that still allow US players BetOnline seems to be the safest choice. It is in in general considered to have the fastest and safest payouts available to US players.
Software is simple, but quite good. Traffic is decent and although other U.S accepting sites might have a bit more traffic the ability to actually get money out from the site makes it our main recommendation for US players.
PartyPoker has great software, decent traffic and fishy players. If you think the games is too tough at Pokerstars you should give PartyPoker a chance!