Omaha is a very interesting game and very dynamic. I played 4 and 5 card Omaha and once in my life I saw people play 6 card Omaha. The main thing here is to understand several main differences from Hold'em, this is that 2 cards from the hand must be played and to understand the range of starting hands. Well, there is such a thing - variance, in Omaha it is much higher than in Hold'em. I haven’t played High Low, but I’ve heard from people I know who say they liked it. As my friend said, "Omaha is a game of nuts and draws."