We have about 17 days until el classico, so we are not going to see the game anytime soon. But looking at the teams, I would say Barcelona has a big advantage right now, looks like we are going to see them get the win because Real Madrid is still having hard time getting Mbappe to adjust playing at the striker position and he still goes to left a lot frequently (maybe that's the tactic but it's a bad one) and they do have plenty of injured good players as well.
17 days with many of them are for international matches and both Real Madrid and Barcelona have many players who are called for their national duties. They have many concern that FIFA days will bring some unwanted injury cases to their clubs and they will lose some of best players for the important match.
Real Madrid did not want to have that risk on Mbappe and they set up reports to keep this player in their club rather than participating matches for his national team France. This action from Real Madrid tells many things about fear of the coming international matches.
So maybe Barcelona has a bigger chance of winning, obviously when we are talking about el classico there is no way of knowing what's going to happen, no matter what the situation at the moment is, both teams could still win and this is why we need to wait for this game.
Barcelona have same fear like Real Madrid but generally Real Madrid improved their performances after bad start and now both teams are nearly same in their forms before the El Classico.
Even though I am a Madrid fan, I will not underestimate Barcelona. And the reason is quite simple, the two teams sometimes have different strategies and goals.
Underestimate your opponents is terrible and underestimate an opponent that is leading you on the league table is weird and unacceptable. With Hansi Flick, Barcelona have a mixed tactics of tiki-taka and more direct attacks and this tactical change helps them to increase their attacks more speedy and more dangerous.