...as the Dank Souls guy here? I'm pretty sure, with equal-ish speed and dura, Ichigo probably pulls ahead, if only by a bit.
Artorias, in theory, may be a more brutal and unyielding combatant, with his poise and berserker rage and whatnot, but against an opponent like Ichigo that wouldn't be all that significant an advantage, given he can counter both with his greater mobility and Shunpo spam. Artorias would also theoretically be more experienced/skilled, but Ichigo's Accelerated Development would allow him to adapt to that in the same way it allowed him to adapt to, say, Kenpachi. Artorias could power-up with his aura/AoE blast, but that leaves him open to get punished because of aforementioned Shunpo allowing Ichigo to jump in, swing, and jump back out in the time it would take, a luxury that The Chosen Undead lacked fighting him and still managed to win without. And, on top of that, Artorias's ranged game is kinda garbage compared to Ichigo's, which I'm sure he'd figure out sooner or later. He's not exactly an idiot, he knows when melee has a good chance of him dying involved.
So... yeah, Ichigo, I guess. Don't think it'd be easy, though.
I'm also pretty sure Artorias is missing a few abilities from his powers/abilities section, and his stamina could probably use a boost given the pretty heavy implication that he's been fighting for who-knows-how-long straight in the Abyss (long enough for a Lordsoul bearer to go insane, clearly), but oh well.
