I see no reason to think that Urias can be as good as he was at 3B and yet won't be good at 2B if given extended run there. Not everybody who can play a good 3B can move over and play a good 2B, but I think athletic guys with range like Urias almost always can. Its not like he's a slow guy who just happens to have quick reflexes and good hands.
I won't argue he'll be better at 2B than Frazier, but he'd be fine to good and Frazier can't really hope to hit as well as Urias even if he's able to bounce back from falling on his face for 800 PA since he was traded in 2021.
We don't have to choose between them, can play either one, so that's nice. But I'd have Urias ahead of Frazier to begin the year.