Barcelona has difficulties scoring goals, while Real Madrid scored 5 goals against Atletico.
I know that some of the goals scored by Real were a little bit lucky, but that doesn't mean that the attacking players of Real are weak.
Real Madrid is the clear favorite for winning the Supercup of Spain. They will become even stronger, when Mbappe joins the squad in the summer. Barcelona probably needs a new coach and several new players. Xavi can't find a way to make the team score more goals.
Atletico Madrid is not a big team that will challenge Real Madrid when playing. We all know that Real Madrid performance is very good this season and they are the favourites. I think with the current performance of Real Madrid, they can concur with any team that comes their way and also think that Real Madrid will be the winner of this season. Although you are right that you said they have some weak positions, I think they will soon get rid of that if they get some players to strengthen that position. I can see that since the departure of Kareem Benzima, Real Madrid have been facing a weak attacking position. I hope they will get Mbappe this summer to strengthen their position.
However, for Barcelona, they managed to win Osasuna in their previous match, but that is not the case. Barcelona has been facing some challenges throughout the season; most of their positions are weak. I think they need more new players to strengthen the team, but even their coach is unable to manage the team, and that is why the players are playing in such a way. I know that Barcelona has a few players that are doing well, but due to a lack of other players that will strengthen the full squad, they are unable to perform well.