Hockey is the best since you can fight in it. Although women's soccer is pretty sweet too. Anyway this is my definition of a "real" sport (as opposed to a leisure activity): Any sort of exertion upon the human body where there is a possibility of injury due to actual human to human physical contact. Examples: Boxing, Hockey, Football, Soccer, Rugby, Basketball, Baseball, Mutual masturbation (hopefully with someone of the opposite sex), etc. Non-examples: Bowling, Nascar, croquet, needlepoint sewing, one handed typing at the computer, falling down a set of stairs, etc. Please note these are the author's point of view and that most of these examples and non-examples alike can be considered "spectator" sports. I do not spectate others while they do "one handed computer typing" nor do I condone it.
Basketball all the way! Last time I checked, basketball was at least in the top 3 sports category. Also, there are some great games based on basketball like nba street series and nba live series.