The champions are seven points behind leaders United.
And Arsenal boss Wenger, who faces City today, insisted: "They are not necessarily stronger than last season. That's mainly because they were so strong last year.
"The championship is not over, so let's judge teams at the end of the season.
"Of course in the Champions League it is finished for them but in the Premier League we'll see at the end of the season. It is far from over."