I only tried Full Tilt and Poker Stars.
FTP has a better looking software (PS is really ugly in comparison) and better tournament structures for my taste (less % of players paid but better rewards).
Cash games are an issue if there are no ongoing promotions, it seems people are uninformed about the ownership change etc. so bad image lingers.
Rake is slightly bigger than on PS but there are a lot of promotions and with some rudimentary strategy it is possible to get very good rakeback + bonuses.
That being said, in 2014. I plan to play on both depending on promotions / bonuses offered.