It's not neutral if you DON'T give him those adjustments. A 1st level AD&D fighter doesn't start with max hit points, but a 3E D&D fighter does; second, a 3E fighter will at mid-levels have a higher AC than a 10th level AD&D fighter, going by the rules in respective editions. (Check the pre-generated character rules in the back of the AD&D DMG, as well as comparing characters from various campaigns).
I didn't give the AD&D max 1st-level hit points. (I gave me calculations in the parathetical notes.)
3E fighter will at mid-levels have a higher AC than a 10th level AD&D fighter, going by the rules in respective editions
No. If you are looking just as mundane armor and Dex bonuses, they will be essesntially the same.
D&D3: full plate, heavy shield = AC 20
AD&D: field plate, shield = AC 20 [0]
[My memory correct?]
If you are talking about magic, then that is up to the DM, not the rules. There is no rule saying that a 10th-level fighter *will* have or even *should* have X magic at Y level in either edition. There are guidelines for both editions, explicitedly for creating the character at 10th level, but no
rules on how much magic they either should have when *played* up to that level.
But even if you did give the D&D3 fighter more stuff, he still has half the staying power against a hill giant compared to the AD&D1 fighter.
But anyway, it still shows that, as someone else mentioned, the numbers have gotten bigger all around the game, and comparing power level straight between editions is not a good measuring stick.
Quasqueton