First of all, I never really understood the scoring in football. How is 1 touchdown 6pts?! Anyway, I think that soccer players are more physically tough. A soccer game is 80 mins (for hs), but football games are only 48 mins (hs). I'm sure everybody can tell that 80 is bigger than 48. Also, though, it is true that not all 11 players play the entire game (football and soccer), but it's i think it's safe to say that more soccer players are playing the 80 mins than football players playing 48 mins (make sense??) It seems to me that a football game is really just a game between two people (the coaches!)
Football and soccer seem to both be equal in mental toughness, though. I have never played football, but i've played soccer all of high school. And this is just how it looks to me.