It has always been so for long. Real Madrid or Barcelona will definitely win the league next season, but we can't tell for sure which of them is the favorite. Barcelona only added one or two players to their squad and the team bond is already there. Unlike, Madrid that has a new coach and needs to understand every player potential so that, he can use them at the appropriate time for the right wings and positions.
Barcelona looks more like they are going to be the favourite for the season, they look more confident than Madrid, even with the squad I see that Madrid has now I still believe Barcelona is going to do better than this season than they did last season. A combination of Rashford and yamal is going to be a good dou for them which I believe will help them get much this season and also put them at the advantage of possibly winning the league this season.