In my opinion, for a driver and mechanic friendly unit, the Ford Model “ A “ takes the cake.
The Caddy 45deg V16 we drove during WW2 was “ neat “ but needed too many valve jobs.

The Kinner 150HP 5 cyl radial I flew years ago ( mounted in a Meyers OTW biplane ) always started and never missed a beat. Had a loping sound not unlike my 1936 Harley 61cid bike.