European clubs have the best players in the world, so basically they are superior to the clubs from other regions, and don't let what is playing out in the Club World Cup make you believe the South American clubs have a chance against European clubs if they meet in a more competitive tournament. European clubs will still win the Club World Cup trophy to show their supremacy to the clubs from other regions.
You know European clubs rolled into the Club World Cup off fumes, there is no rest after a brutal season, so they are playing like tired sportsbettor unsure of their next move. I will say atleast one month break would have let them reload both mentally & physically.
however American clubs are showing kinda scrappy, strong hands, also cashing in against big team. you know Botafogo and Inter Miami have already won surprising victories. I would say that in the knockout round, the European teams will definitely be more serious about their matches. And the title will definitely go to Europe.