Boxing hands down, the excitement of watching a fight is only increased by making a bet on the fight that way Im even more involved in the result of the fight than what I will be otherwise.
I am a boxing fan but the problem with boxing is that the promoters are just shit as they are not capable of giving the fights what fans want and now i am an avid MMA fan because they deliver what the fans want,so these are the events that i look into mostly and then comes football ,cricket and occasionally tennis .