I personally like to play in the different kinds of Poker: and NL Holdem, and PL Omaha, and China Poker, and etc!..
I think, this is very useful for my common development in Poker!
Both. I'm better in Holdem but there are more clueless players in the Omaha-variants. Plus it is more fun to mix things up. I wish mixed games like Horse and 8-game were bigger. More variants = more fun.
Playing poker professionally is just as much a job as any other, so the decision to become a professional must be deliberate. Only after weighing all the advantages and disadvantages of a professional game, you must make a final decision. That's why you choose)