Barcelona is indeed likely to be better next season, especially with their success in winning the La Liga title last season, making the team's mentality and confidence seem to be back again, but don't forget that Real Madrid has made great improvements so that it is possible for a balanced competition to occur next season between Real Madrid and Barcelona and I can't favor one of them because as usual the rivalry between the two is quite fierce.
The competition between Barcelona and Real Madrid will be even more competitive next season because both teams have made several efforts to bring in a number of players so that the fight for the La Liga title will be even tighter. Real Madrid will try to make several adjustments with their new coach while Barcelona will be much more solid because they are already well connected with the coach. La Liga next season will still be about rivalry and I am sure that both teams will compete for the title because if you look at it, there is no other team that might be able to match them in terms of fighting for the title.
It is true that teams are starting to reorganize for the upcoming season and Barcelona and Real Madrid and other teams will select the best players for their teams. Barcelona finished the 24/25 season brilliantly and won the trophy. The experienced and young players they have may be enough for them, but they may have to rebuild the team with more changes. The main problem for Real Madrid is that their defense side. Team management should significantly reform so that they can equip the team with strong defensive players for the upcoming season. The newly appointed coach Xabi Alonso is doing well. Real Madrid is already playing well in the group stage matches of the Club World Cup and is at the top of the group.