Ahead of the FA Cup's stand-out clash on Monday, why the priorities of both sides are markedly differently.
Winning the FA Cup would be enormous for Louis Van Gaal - a trophy to which he can cite as justification of his methods, an excuse to harp on about his way of doing things, a way to get the increasingly large number of naysayers off his back.
So, while achieving a top-four spot will obviously remain United's priority this season, significant impetus will be placed on the cup, too.
Wenger was in a similar spot to his Dutch counterpart last season - seriously under the cosh, with his back-catalogue of success no longer holding as much sway, questions arising if he were past it.
Then, he needed the FA Cup to banish that unsightly record of years without silverware.
Now, he has bigger fish to fry.
While beating Hull City at Wembley last May bought Wenger renewed faith and patience - albeit only brief - this season, it wouldn't silence his boo-boys.
Especially given the nature of their capitulation against Monaco in the Champions League - with qualification for next year's tournament hotting up dramatically in the league.
Yes, a win at Old Trafford would be a short-term boon to the confidence of players and fans, but nobody at The Emirates would class retaining the FA Cup as a successful season, rightly or wrongly.
With the big money capture of Alexis Sanchez last summer, as well as the acquisition of Danny Welbeck from this weekend's opponents, Wenger was again backed in the transfer market.
A section of the Gunners faithful will continue to eye the Frenchman with distrust until he delivers a league title or Champions League success - an FA Cup won't be enough.