The one that is in the 1st Edition AD&D PHB.
Yeah this.
He got a bonus to surprise rolls
He got massive bonuses to damage "giant class" monsters which, despite the name, was nearly any humanoid in the MM.
He got tracking and herbcraft.
He got arcane and druid spells of 1-2 and 1-3 levels at high level.
He got the ability to use crystal balls (no joke) or other divination magic items
He had to be good aligned.
(He also got 2d8 starting HD, which I seriously doubt is going to make the jump to 5e)
Whats more important is what he didn't have:
He didn't get any bonus to dual-wielding weapons or archery.
He didn't get stealth skills
He didn't have animal empathy
He didn't have an animal companion (save perhaps for a henchman)
He didn't have choice of a favored enemy
His abilities weren't crippled by wearing heavier armor than St. Leather.
My theory is an "Aragorn" style ranger is going to focus more on combat more (using heavier weapons, shields and heavy armor) and be more mystical/magical than sneaky/skirmisher. Another way to say it is he might be more defender/leader than striker/skirmisher.