With the exception of the ranger class which I would pull over from 1e, I'd play 2e in a heartbeat over 1e. No question.
I don't joink the 1e Ranger, because I never fully understood the Aragorn connections behind its class abilities...
... but I did give Ranger improved Thief skills and improved spell access. (Starting at 4th, like I did for Paladin and Assassin). Climb Walls, Move Silently, and Hide in Shadows
not restricted to "natural environments", Backstab x2 that didn't improve, and their Priest spells expanded to include Elemental (all), Travelers, and Weather. I've
never liked Favored Enemy as a
class feature because it just feels... too specific to be based on class-and-level and not connected to campaign events.
As a Ranger-only use for Proficiency slots, which is a concept AD&D barely touched? Would've been sweet.
( healers were not very popular choice )
One thing that I think 3.X and PF1 and 4E do not get
nearly enough credit for, and which 5e
again leaned away from, was letting players play
healers without forcing them to be
clerics. I don't want to get into why this is so important to me, but it was a
big deal when 3.X and PF offered me non-Cleric
primary healer options... and mildly frustrating that Bards in 5e have to struggle to keep up with even non-healing focused Clerics, and Druids are not much better (than Bards as healers, or Clerics as not-being-clerics).
Not to many people around here are anti dragonborn.
Hell you can pick phb or fizbans ones in my games.
Yeah, and I want to make a note here-- I got no problem with Dragonborn, I just don't want them or tieflings (or half-orcs or gnomes)
in Dark Sun. Even if you want to reskin them as draconians in
Dragonlance, I'm okay with that--
they're close enough-- but don't add them to Athas and don't try to tell me they're dray.
Replacing tieflings with genasi for the DSCS 4e book would have been
dope.