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 .
You are right on that, promoters have been a cancer for boxing for a long time, but that is only one of the many things that are wrong with boxing, sometimes there are big scandals too about the way the fights end and the result with judges that do not seem to be able to judge a fight.