I voted 8.
The highlights for me are the better organisation overall, most of the changes in the classes, the monster manual (almost all of it; these monsters are simply better for me, less complicated to run, less complicated to choose, better as threats, more diverse; simply better) , the new encounter guidelines, the simpler framing of it all, with warts and all (like the blanket DC15 difficulty for everything, I quite like that).
The downsides are some small details like innate sorcery or aura of authority, the feats becoming core (though it's less grating than previously envisioned, you can just have an origin feat which are less annoying than the others, flavorful even, and you can't optimize both attributes and feats, you have to choose; choice is good).
I still like 2014 though (it's the same game, really, and it's my favorite edition), and I will gladly play in a 2014 campaign. But for me, the transition was seamless and quite positive. No turning back in sight.