Soccer Brands :

Football is all about make contact with. At the line you usually have between 7 and 10 guys slamming into each other every play, not to mention the actual tackles, which often involve players other than the line.

The hits are also typically far more violent than in soccer. Football players tend to be a lot bigger and stronger than soccer players, so the hits are going to be harder (soccer players are better overall athlete though...I used to play and its not easy dragging yourself up and down the field for 90 minutes!). Of course, soccer players do make a lot of contact and don't wear pads, so they certainly risk injury. But for pure amount and severity of contact, football has more.