To me arsenal performance was more better than that of Manchester united rating from the position. Manchester would have done well if other players were serious with the game the way christiano Ronaldo was serious, Ronaldo was even the one who helped Manchester to get to the point where they reached.
There is no doubt after having the worst start of season Arsenal done amazing job and their end at fifth spot was surely one of the best for them and their fans because there were no chance like this for them to have this spot after the worst start which give them back to back defeats but Arteta was in good mind, and he fights back even after having few issues within team, and they have to drop their captain Auba due to discipline which is surely tough decision but still have good impact on team's performance.
But on other side Manchester United even having one of best squad but still fail to have any impressive result in all season and their miseries are not going to end after changing two coaches now they have new coach, and he is trying to have some quality players hopefully this will bring some positive changes, and they could be able to have top fight for the next season.