Been a few topics about this over the years.
https://pinside.com/pinball/forum/topic/best-floor-for-a-pinball-1
Just one for example.
Bottom line is what do you want? For me I am on painted concrete, but my next floor is probably going to be commercial grade unpadded glued to the floor. Something I can shop vac if ever I had a plumbing break from upstairs and not have to remove or worry about nasty black stuff growing under a subfloor.