both at the same time, like they do in european leagues.
In each European country, there are two soccer tournments. The national league has only 20 teams and uses the round-Robin format. It is the most importante tournment. Only the richest teams have enough money to pay high wages, have the best players and win the league. The national cup has many more teams and uses the playoff format. Poorer teams win these cups sometimes. They are not as importante as the leagues.
Er, yes, I'm aware of how European football works.