Gen 3 better who needs bk straps that get loose and pinsFor me, it’s grip angle mostly. I do not like to use the weak/flexing back straps on the G4/5 series. Although I have used them on the G26/27 size subcompact pistols and they are better. I have to do the strong side trigger guard undercut on my Gen 4s but not the Gen 3s.
I also use the Glock “-“ trigger connector and the Orange NY2 trigger spring in my Glocks. I just like the trigger reset and trigger feel with this set up. Anyways, these setup seems to work best on the Gen 3s.
I do like the Gen 4s recoil assembly, for the G23/22. I can tell a big difference between the two generations in 40S&W.
And who doesn’t love that frying pan finish on the Gen 3s!?!?