I started with 2e, played 3e for awhile, and picked up the 1e books for a change of pace. Philosophically, 1e is better, because 2e was a rip just to keep the original writers out of the royalties and corresponded with some horrible business interest taking over the company to screw gamers and make mega bucks (which, or course, never materialized). The source books for 2e are... really bad. Late 2e is kind of shadow 3e, with no elegance, like Skills & Powers. That book sucks really bad in my opinion ("bane of my existence" in high school, actually), as well.
2e fixes some things, but you can always get non-weapon proficiencies from Wilderness and Dungeoneers' Survival Guides. Combat in 1st edition is nearly impossible to decipher because of some contradictory statements, but if you look on Dragonsfoot forums, you can find some ok answers around the contradictions. If you actually get it right, I think what 1e combat is supposed to be is a little better.
One more thing, 1e rulebooks are not arranged so well. But they're fun to read!