KO SnG is more profitable. If you are "skilled" player. First, the weak players in this formats more often have some profit. They "stick around" longer. The ICM pressure is lower, because of the bounty. If you are good, you will make profit from that. Also the players are more crazy there, gamblers.
But on MTT SNG KO the variance is higher. You need the first place. Often enough...
Sorry for my English...