These are not playoff systems for a championship but for a promotion/relegation
And again, UEFA CL is NOT (look that up if it is confusing) single country league. Once Chiefs start playing Montreal Destroyers and San Salvador Bulldogs in North America Football league than we can compare US sports leagues with UEFA CL. until then, try to find a country in which there are playoffs after league season is over, only US does this garbage and makes regular season generally un-watchable and meaningless
UEFA Champions League is the finest competition in world football. It's a league-then-playoff system. Real Madrid ring any bells?
The winner of the Championship playoff joins the best, richest league in the world. Bottom feeder, lmao.