Finally, El Clasico was created again in the Spanish Super Cup Final after Real Madrid successfully defeated Mallorca with a landslide score of 3-0. El Clasico has been held 9 final matches throughout the history of the Super Cup, 7 finals were won by Real Madrid and Barcelona were only able to win 2 final matches. It is no wonder that Real Madrid was able to advance to the final very smoothly because the opponents they faced were easily defeated, Barcelona was very lucky to be able to eliminate Athletic Club because the team performed very well this season.
This is something we have been waiting for, we were hoping for an El Clasico in the Supercopa final and yes it did happen. But this was also predictable, because after Barcelona made it to the final they were just waiting for the match between Real Madrid vs Mallorca, and it was predictable who would be the favorite to win the match between Real Madrid vs Mallorca.
Looking at the history of their meetings in the final, Real Madrid has indeed ended the match with a win, that is also a good capital. But on the other hand, both teams are in a less favorable situation, so it is also difficult to predict this match.
Yea, it's definitely going to be difficult to predict because this two teams are top teams and it's also a final, though the head too head record favours real madrid to carry the day just as you have rightfully said but that doesn't guarantee that real Madrid will surely be the winner, let's not forget that this Barcelona team led by hansi flick knows how to beat top teams, because they have demonstrated that with their performance against the bigger teams this season, not just in laliga but also in the uefa champions league, so in as much as real madrid look the favourite team on paper to win this final, due to their present form and their dominant head-to-head record in the final against Barcelona, I still don't think it's going to be easy for them because anything can happen in the world of football.
Then another aspect that I believe that is going to decide this game is the tactical impetus of both coaches, any of them that tactically outclass the other will carry the day, and to me that where the real battle is if am not mistaken, because in game like this it's the tactical abilities of the coach mostly that determine who is going to carry the day.