Personally i would go for Adam Wharton instead of Ugarte. More creative, more controlling and dictating the ball.
Plus Wharton is left foot and can be back up for Martinez as CB with left foot.
Like this :
Bissaka - Yory - Wharton - Shaw
If Shaw can play LCB and Wharton can it too in needed and crisis.
De Ligt + Ugarte = Adam Wharton
60 -70 mill euro for Ugarte vs 30 -40 mill euros for Adam Wharton. If it was me. I would go for Wharton
Wharton = playing more dominating and controlling against team that park the bus. The way Ugarte controlling and spreading the ball around is not the same as Wharton. Ugarte is most useful against top teams with high line.
Ideally it will be :
Wharton for Eriksen
Ugarte for Casemiro
But Wharton has top tackling and defensive ability too. Break up opponent attack:
https://www.whoscored.com/Players/430774/History/Adam-Wharton
Wharton had 3 tackles average in each game for Palace last season. Interception 1.3
Ugarte 3.9 tackles average and 1.6 interception.
So average on tackle lesser than Ugarte.
But with key passes. Ugarte 0.6 vs Wharton 1.3 in avg in key passes
https://www.whoscored.com/Players/408962/Show/Manuel-Ugarte
Like above. Adam Wharton is better with the ball and with the creative and offensive. When Ugarte had around avg 1 more tackle.
And if United and Ten Hag want to play proactive and dominating football. If only one of them. United need Wharton more thand Ugarte. A more complete cm player.