Among R candidates, Trump is the only one without name or "This is where I stand" recognition problems. De Santis is next best, but is well below Trump in those respects. Ramaswamy and Christie have both problems, and Pence and the other Who? candidates even more so. De Santis has been traveling about a fair amount, but even he is having $$ problems and is laying off staff. I'm sure Christie's campaign is even less well off.
Speaking only for myself, I could easily vote for Trump or DeSantis or, probably, Ramaswamy against Brandon or Kammie or Dem to be Named Later. With Christie it'd be a close question between voting Christie or Snoopy.