Arsenal have quit well performance in this season and I don't sure Liverpool have compete for surprising Arsenal, still favorite with The Gunner will win this games and keep large opening with Primer League tittle in this season.
If you look at the performance of the two teams, it's not wrong to make Arsenal the favorite in that match, but have you forgotten that Anfield has been the most haunted place for the red London team so far? Liverpool is in a bad condition, but for the match later, Liverpool have the chance to get back up, especially before they were able to hold Chelsea to a draw and we can see that so far Liverpool are still a pretty great team when they have to face big teams.
It will not be easy at all as it seems but given the form Arsenal are in it is expected that Arsenal will be the one getting the full points out of it in the end. In the game against Chelsea, I honestly feel they were lucky to get a draw as Chelsea had lot of chances but due to lack of chances they weren't able to convert them into goals. Now they have to face Arsenal who are very good in creating chances and finishing as well so I think Arsenal will be able to get good amount of goals early in this match.