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.