Generally, I'd play Timber-MLS away from home and White-Calafiori at home (against the bus parkers). Arteta going for White-Cala suggests to me he's expecting Man United to park the bus. Going by our last 2 encounters that's likely going to be the case.
It would be interesting to see how we deal with their overly negative tactics this time as we really struggled to break them down during previous encounters. Amorim seemed to have figured out Arteta but he now has more 180 minutes of footage to go through and devise a plan to counter Amorim's tactics (which is to pack the midfield, force us wide, double or triple mark our wide players and hit us on the break as soon as they win the ball).