Well, I don't have a fav per say, but I do keep detailed records of all my wagers. Glancing at the records now, I discover for the first time that College hoops is my fav. College foots, my least fav. Profitable years vs negative years are listed below. Eight years worth max.
NCAA Basketball 6-2
MLB 5-3
NFL 4-4
NBA 4-4
NASCAR 2-2 (yes, I bet NASCAR head to head. Its the only way I can watch it)
NHL 1-3
NCAA Football 2-8 (ouch)