Most profitable type of gambling.

[Huh]

Had an argument with a friend a while ago about the most profitable type of gambling for a skilled player. By profitable, it is meant that a person is maybe a top 3-5% player in the specific field.

He contends that it is probably back-gammon(sp), or poker. I believe it is sports betting. My reasoning was that sports-betting offers a vast pool of un-educated players a low vig (5% is common online as well as dime lines for baseball) and there is a lot more oppurtunity to take advantage of a profitable situation for a large sum of money (i.e. you don't have to sit on a huge bankroll, cause the big-game is filled with pros). Opinions?

-Huh