For MTT I like Omaha hi/lo. It is easier to gain traction early in tournament if you are lucky. Also, Omaha its a lot easier to have your "made hand", full house, for example, get crushed, by four of a kind, or a straight flush. MTT freeroll, to be exact. Omaha is such a crazy game, I like to lose free money, not coin of the realm..
For cash games, I prefer hold em. If you've played enough games, you get used to the action and the variability. It's not the roller-coaster of Omaha, but hold em has it's highs and lows. Those variaiations are enough for me to take seriously. I am open to all variations, to try new games, shake up the usual routne.
