Don't play too many variations of Poker, be good player at one

You may have heard of the expression "Jack of all trades, master of none", well the same can apply to Poker. With their being a number of variations of the game is it better to be able to play every game OK or be good at one version?

I'd say you stand more chance of winning more if you are good at one version than being OK at a few different versions!
Playing the one version of poker that you are best at or enjoy the most will ensure that you don't confuse the games and don't inadvertently mix the rules up. Also just playing the one will help you understand the game better and help you improve you're strategy!