best, best, best, usually means the wrong thing ... generally "highest performing". The Consumer Reports version of "best", which gets check marks in more categories, but has little or nothing to do with actual use and life experience.

I knew a man who was arguably the 'best' mountain climber of his generation. He bristled at the word "best".

"The best climber in the world is the one having the most fun!" -Alex Lowe

By this more thoughtful definition, the best 35 mm camera might be the one used the most by the most people with the least trouble and the most satisfaction. I don't know what that would be (I like mechanical cameras) but these days it might actually be a DSLR.