I know most people will favor certain Sport, because they know more about the players or the teams and information is power, when it comes to betting... but some Sport are 50/50 when it comes to the outcome of the match. (One lucky punch or kick can make a underdog a champion)
It's not actually 50/50 if you know the team it is just the percentage is much higher than the usual, well of course there are underdogs who are making their way and of course there are teams that will beat the existing one some times it is the new generation but just like what I have said the chance of winning in certain sports where you have expertise is higher than placing bet in gambling site that you are not familiar with.