Football is much easier to comprehend and enjoy than American football, period. Not sure about Baseball, but baseball sucks.
Also, the clock keeps going in football because it would be a bitch for the referees to stop the clock every time something happens. It's much easier to let it go and then add on minutes that were "lost" during goals, fouls, and out of bounds play. Plus, the clock is unique for sports and complements itself perfectly to football in the way that it's suppose to be free flowing and fast. When a lot of fouls occur rapidly in other sports, people don't get frustrated about the break up in play, but by the fouls that were committed. In football, it's both. You see, when a bunch of fouls are called back-to-back, you'll start hearing jeers from both sides of the fans, and you'll most likely hear to commentator say "let them play ref."
Football is free flowing, and that's exactly why the clock is as well.