Arsenal have 18 fulltime and 5 caretaker managers, so that would be 23 managers. Manchester United have had 19 managers.
arsenal have beaten Manchester utd way more times
Manchester United FC.
Arsenal - 39 Honours Liverpool - 63 Honours Liverpool
Tottenham were the first, in 1963. Then it was won by West Ham (1965), Man City (1970), Chelsea (1971 and 1998), Everton (1985), Man Utd (1991) and Arsenal (1994). The competition was of course disbanded in 1999.
As far as history, Manchester United has more trophies than Arsenal, and are currently doing better in the Premier league.
Arsenal have won the F.A cup ten times, only Manchester United have won it more, they have won it 11 times.
Manchester United. Teams that class Man uinted as their rivals are; Liverpool, Manchester City, Leeds United and Bolton Wanderers. Aswell as those teams, there a more teams that have a dislike for Manchester united; Arsenal, Everton, Wigan, Rochdale and Bury.