Ideally you platoon them to get the best of both worlds, with Martin also serving as a pinch runner/hitter/defensive replacement/occasional starter elsewhere when a righty starts.
Caratini is a sure thing. Martin is probably the next closest to a sure thing to me - decent defender and athlete, hits righty, played well down the stretch last year.
I would have said Clemens was a sure thing if Rocco was still the manager because the last coaching staff really seemed to like him, but I don't think that's the case with the regime change. I'd still rank him 3rd in probability to make the bench, but he is in a weird spot competing with many different others, both guaranteed and bubble guys (Larnach, Bell, Wallner, Roden, Outman, Wagaman), for a spot and for playing time.
Realistically, one of either Kreidler or Gray has to make it in order to have a shortstop-capable backup infielder, I don't think there's much chance both make it. It really comes down to whether you prioritize defense (Kreidler) or offense (Gray). I guess Arcia and Urshela are in the mix here too, but they are long shots to me.
Outman and Roden are directly competing with one another and almost certainly only one makes the team barring a Larnach trade or another move. There's a conceivable world where neither make it if the team feels they can roll with Martin/Clemens/possibly Kreidler to back up the outfield.
That leaves Wagaman, who is in a weird spot. He'd have a better chance if Martin wasn't a near lock to be a bench righty to me, or if Bell or Caratini were lefties instead of switch hitters. But he's hard to carry as a short-side platoon bat with limited defensive and baserunning utility.