The college game
In the United States, the College game is very different from the professional. There are rule changes that affect things from the field of play to overtime procedures. The level of play is slightly higher in the NFL. This is because only the best players at the college level are drafted into the professional game. There is an added level of athletic development and experience.
In addition, the rules are stricter and force a more “pure” game. The NFL rules are harsher, forcing teams to be mindful of clock management.
However the college game has an atmosphere that cannot be matched. Hordes of college students cheering their schools in hundred year old rivalries is a unique experience.