Arsenal definitely knows if they want to be table till the end of the year they have to win this match but this does not mean West ham will be sleeping in the match. I guess we all can agree that Arsenal will win this match but I don't they will be topping the league for long, Liverpool more likely will be crown Epl champion, since City are far from their best and still continue to have injury woes
What gives you the assurance that Liverpool will be the club that will be this season EPL winner. You are too quick to judge because we just got to half of the season with 19 matches played, this cannot make you give Liverpool the favorite club to win because they are topping the league. If Arsenal has being topping the league for few weeks now and still they can't beat their chest to say that they will be the winner. Manchester City started topping the table in the beginning of this season but now look at where they are. Every club will still be faced with their misfortune and whoever an overcome it with losing much points will win the league.
I was wrong thinking Arsenal would win against West ham but I would say in the long run Manchester City as better chances of challenging Liverpool for the Epl title but they continue to suffer injury crisis and this season might be an unfortunate for them just like how Liverpool were unfortunate except Pep can turn things around like Ancellotti which I think he can't now and things just got worst with John Stones injury but I guess he could get some players this January. Arsenal are too inconsistent among the 3 and so even if they top the league for weeks that won't guarantee us to say they will win it but you see Klopp and his men are different