Going by statistics and H2H it's more likely for Arsenal to win as they have a better record when compared to that of Chelsea most recently, Arsenal has really been brilliant this season and with wonderful results they have made good records as compared to that off Chelsea from the beginning of the season, so far Arsenal has done better.
Arsenal has quite good capital in facing Chelsea in tomorrow's match because Arsenal in their previous match was able to beat Manchester City, which can be said that the Arsenal players have quite good motivation to continue their victory when they face Chelsea. Playing at home, of course, Chelsea doesn't want to be embarrassed by Arsenal, which could mean that this match will be quite fierce. Even though Chelsea's performance this season has been unstable, it is still believed that they will provide interesting competition in tomorrow's match.
Chelsea recently have recorded two wins just before the international break so it can be said they have their morale boosted currently and the can be ready to give a trial at Arsenal to test how well they have improved their ability to perform better as compared to how they started at the beginning of the season. But then Arsenal is at the peak of their confidence as they have won one of their biggest challenge in the EPL recently, they will most likely be very confident over Chelsea knowing the recent status of Chelsea, they would only have some strong resistance From Chelsea but then they are sure to get a win or draw but never a loss.
Yes, Chelsea recorded two wins in the previous match, which might be said to have found the best form of their performance. I think their chances for this match are good enough to secure 3 points because they are playing at home. In terms of players, maybe Chelsea will experience quite a lot of problems in tomorrow's match because many of their core players are absent due to injury. for Arsenal they are still not strengthened by Saka in tomorrow's match because he has not yet recovered from the injury he suffered when facing Lens.