I am a bit old fashioned. I like playing 7-Card Stud, but unfortunately, games like that are rare in a casino unless you go to Vegas, and even then, I have found a hard time finding them. Hold'em is fun, and I am still trying to get a grasp on Omaha Hi/Lo.
I like all forms of poker, but only focus on some to master. True pro's know almost all variations and play them well. Everyone has their weaker games, though.