I really find it hard to choose a Favourite, I love to play Omaha, 7 Card Stud, 5 Card Draw and No Limit Holdem, Unfortunately it can be a while before most of these games will fill a table, So you either have to sit around waiting for a game to start or try playing 2 different games at the same time.
But you finish up playing different Blind sizes which can add more confusion into the mix, and I like to play to relax, Playing 2 different Poker Styles is really adding pressure that I don't enjoy.
So most of the time I will stick to Holdem as it is the more popular Variant and you can always get a game.