Good rundown, here.
It's hard to compare their defense, and if Bichette plays 2B for us, we may see he's about the same as Marte.
Here is what tips me to K Marte, despite the age difference: POWER!
2023-2025:
KMarte: .236 ISO and 35 HRs per 162, .519 SLG (.887 OPS) .251 ISO '24-'25
Bichette: .154 ISO and 19 Hrs per 162, .445 SLG (.778 OPS) .146 ISO '24-'25
Now, if we get Alosno or Schwarber, I'd be fine with the secondary piece to be Bichette (or Bregman)
The second big tip to KMarte is his $19.4M lux tax line on the budget. Bichette, Bregman, Alonso and Schwarber will make much more AAV. Granted, they won't cost players/prospects to get, but I want one from KMarte, Alonso or Schwarber.