In Hold'em, if you go all-in preflop with AA and get called by KK, you will be a huge favorite to win the hand (better than 4 to 1). Essentially, with pocket aces, you will be far ahead against any hand you put in preflop. And in fact, in Hold'em there will be many situations where one hand will dominate the other.In Omaha, this will not happen; here, even the best hand will often have only 60-65% equity against the average 4-card hand.