Currently I would put Barcelona ahead of Real Madrid. Because all the players of the Barcelona team play the match with great responsibility. On the other hand, if Real Madrid has a dedicated striker, I think the team will be complete.
Madrid is probably much more experienced in the UCL than Barcelona, even Barcelona failed last season, if you look at both of them playing well, just look at the domestic league at the moment Madrid is far superior with 3 wins in a row and established them at the top of the standings so it looks like they are right really consistent even though they have not found a striker who can replace benzema's position.
There are too many rumors about Mbappe being able to replace Benzema as a striker in Madrid, but it hasn't been achieved yet and the results are still the same. Madrid with the current squad is also sufficient according to Ancelotti, but we'll see how it goes, no one knows how the two will play in the UCL this season, but what I see in the domestic league is that Madrid is far ahead of Barcelona.
Yep, Madrid has more experience in this competition than Barcelona. however, Madrid's situation is different now, IMO. The problem is, they don't have players who can be goal getters like when Benzema was still with Madrid. The chemistry between young and senior players becomes a very deadly combination in the opposing team's defense area. as well as the roles of Luca Modric and Kroos, these two players have always had a big hand in Los Blancos' wins.
Now Madrid is more dominated by young players, as well as for the front line. I don't doubt Vini Jr, Rodry and Bellingham, but Ancelotti can't always rely on them. moreover, when Madrid against strong teams in this competition. that's why, in my opinion, Ancelotti needs a well-established centre-forward. so that this team, can use several different systems. Unfortunately, Real Madrid did not sign a striker who could replace Benzema's successor.
While Barcelona, Xavi has strengthened his squad by bringing in several newcomers and several young players. he just needs to create an ideal system to make his team look impressive in every game. for now, we can't see how consistent they are. After all, the league has just been held for a few weeks. There are still many other challenges, which might make things difficult for these two teams. there is no other way, other than we enjoy every game these two teams.