And, sure, Spike may be TECNICALLY "undead", but is that not alive? He's surely more alive in Season 5 of Angel than in the last 5 minutes of Buffy. Besides, he spent 7 seasons on these shows, traveling, being in love, having sex, drinking, sampling blooming onions, having parties, making friends, saving the world, being held captive, playing poker....heck, the guy "lives" more than I do! Granted, I've been to the beach in the last year but that's not saying all THAT much.
Edit:
I think it does get a little "let's not quibble" Spike in Damage gets insight in the fact that he did a lot of damage. Angelus damage was different, and personal but Spike still wrecked a lot of lives. Angelus almost destroyed the world but then Spike almost aided the same thing for his 'Princess'. Do we nitpick and say "yeah but Angelus, more so?" I don't think Spike himself would accept that.
I kind of like Angel's humanistic approach to being a champion anyways. Helping where you can standing up for elements of human dignity with which you can identify, whether you get a reward or not. To Angel is doesn't matter "what you've done or suffered", you can still change and help people.
I just find this interesting. It's a good point.
I think I find the difference in Spike's Damage and Angelus's Damage to be different in many ways though.
Angelus is just a poop. I think of him as sheer evil in many ways. Tormenting people, making Drusilla a nut case, even the way he hopped around Sunnydale happily messing with people's heads. He's like a serial killer who picks his victim, stalks them, lets them KNOW he's stalking them, kills their family and finally comes after them. That's cruel.
Spike strikes me more as a drunk driver. He's not setting his sights on people and tormenting everyone around them and making them crazy. He's just having fun and going on with his life and anyone that gets caught in the crossfire....oh well. But, it's not the same INTENT....other than maybe that first Slayer woman, but then again, she WAS a Slayer and potentially a thorn in his happy care-free life.
He didn't want to end the world. Sure, he admits it's for selfish reasons. But, then again, if I had the option to save the world or send it into hell....I'd choose to save it.....for selfish reasons. My life, my friends, my family...not because I'd be thinking of the zillions of people I've never met and how they deserve to be happy and not thrown in to hell.
In any case...the redemption, in MY mind, is different for the two scenarios. And, sadly, all still comes back to Spike isn't all that bad pre-soul....or pre-chip. As long as you didn't ACTIVELY cross him...and even if you did, he might decide to work with you anyway if it means getting his girlfriend back.