I ran D&D 5E this past Saturday, but I ran Basic Fantasy RPG (B/X Retroclone) this past Tuesday.
So I voted 5E this time.
I run 5E and BFRPG at around the same frequency.
I guess that is why we usually end up just getting together and running a "random dungeon generator" session.
We write up multiple PCs (for when one or more die), have no attachment to them, and just enjoy the hack-n-slash/treasure, social aspect of getting together for an evening of sitting around and BS'ing the time away.
(2.5e + 5e)/2 = 3.75e = PF