Arsenal have good odds even they have high chance to win this match and other side West Ham is on home ground. West Ham is not strong side to give tough time to Arsenal in this match. That is the reason I have Arsenal for this match.
Right choice, compare to both teams Arsenal is the strong team, and they have the capability to win this game. But we can not underestimate West Ham this team can come back at any point in time. West Ham made draw match against Man United, this type of chances also there. But still, Arsenal is the good pick in this game.