Omaha poker is basically the same as Texas Hold'em. Only, you get four cards in your hand (Four holecards), instead of two.
From those four cards that you get, you can only use two of them! So at the end of the game, you can only use 2 holecards, and three cards from the table.
You will probably understand that the chance to have something is higher in Omaha than in Texas Hold'em. So, if you have a low pair, it's very unlikely to win in Omaha compared to Texas Hold'em.
Top 30 Holecards of Omaha (from high to low)
double suited
double suited
double suited
double suited
double suited
double suited
all lower double suited two pairs
double suited
double suited
double suited
double suited
double suited
double suited
double suited
double suited
double suited
double suited
double suited
double suited
double suited
double suited
double suited
double suited
double suited
double suited
double suited
double suited
double suited
double suited
double suited