When Real Madrid played Barcelona, this match felt bigger than the championship itself. regardless of the condition of each team, both will show their best game and each player will bring out their best abilities. Elclasico is still Elclasico and this is the best match.
Of course, both of them will try to be the best in any championship, because Elclasico always provides the best atmosphere for the spectators and fans of each team at any time. So I still think that the match will still be fierce even if it's just a Super Cup trophy, because of course they don't see how important the trophy is, but really see how important it is to win the match when the opponent is their toughest rival so far.