100% depends on the game
I am in the same boat as you both. Totally depends on the game for me too.Depends on the game for me.
Usually I'll go Switch unless there's a good reason not to, as in price or major performance differences.
Musou games are the one exception. I seem to own most of them on PS4. The only Switch ones I have are Switch only (HW, FEW and HW:AOC). Most of them don't have a Switch release though. Of the few that are multiplat, I own them all on PS4.