Chelsea is not winning against Arsenal. I am pretty confident about Arsenal winning this match. Chelsea has been able to win two matches in a row, but this is going to bring an end to their winning streak. Arsenal is definitely competing for the English Premier League title. And they are not going to let things go easily at all. I am pretty sure that they are going to win against Chelsea, the bigger question is about how many goals. I predict it is going to be something like 2–0 at least. I believe that is going to be the list goal difference between Chelsea and Arsenal and it is going to be in favour of Arsenal for sure.
It is very possible, Arsenal is in high confidence after winning the match against Manchester City and also Arsenal's performance is quite impressive this season so it is possible that they can win the match against Chelsea next weekend with a convincing score even though the match is played at Chelsea's home ground.
I think it is quite reasonable that Arsenal are the favorites in this match because the performance/quality of the Chelsea team is far below Arsenal.
I also have no doubts that Arsenal can achieve a convincing victory in this match.