Most memorable wins.

[Karma]

Exactly that.

I will try to narrow it down

Fergie

Manchester United 2 Sheffield Wednesday 1 92/93 season
Manchester United 2 Bayern Munich 1 98/99 season
Manchester United 1 Liverpool 0 FA cup ( Cantona scored the winner) 96 ?
Manchester United 1 Chelsea 1 CL 2008 won on pens
Manchester United 7 Roma 1
Wigan 1 United 2 ( last game of the season where we won the league and I went to this game)
United 2 Spurs 1 98/99 season

Moyes

Swansea 1 United 4
United 1 Liverpool 0 league cup

LVG

City 0 United 1 (Rashford)
United 4 City 2
United 3 Spurs 0 ( the one where Rooney did the punch celebration)
United 3 Arsenal 2 (Rashford scored twice)
Juanfield 2-1 win
United 3 Pool 0
Fa cup final win against Palace

Jose

United 2 Pool 1 this season
Arsenal 1 United 3 this season
United 2 Chelsea 0 last season, last season because it was a more convincing win over this season's one
Palace 2 United 3
EL league final win
League cup final win 

[CaajScot]

A few in the link below but it's a 2007 thread so an update after that will not hurt 

republikofmanc.proboards.com/thread/4852/most-memorable-match