I get confused myself. there's a question of, whether you think love can include obsession. That's where I place Spike's feelings. I recall Bewitched, Bothered, and Bewildered, where Xander has Amy cast a love spell. See, it's called a love spell, but it makes people obsessive. Giles even says that what Amy was feelings wasn't love, but obsession. Then he says if she cared for him, she'd be trying to save him from danger, instead of talking about what she's feeling.
So, it depends on whether you see love as self-sacrificing and caring for another. And can you classify obsession into it, and still call it love when one person is more concerned about what they feel instead of their desired, or partner.
This post is VERY long. Sorry. And it's mainly how I feel regarding Spike's feelings & behavior Pre-Soul. But I do put a contrast with Angel in near the end.
I have always said I don't think Spike loved Buffy, but felt Limerence for her. There was attraction, lust, and even fondness. But I never read it as love, because it didn't seem like he cared about her. Like the obsession spell, it cared more about his own feelings and what he felt regardless of what effect it had on Buffy.
Season 6. Buffy was ripped from Heaven (the dvd commentary saying she was with her mother). But she's taken from paradise, and returns to this world having to break herself out of a coffin. She was not mental stable, nor happy. Spike started working his seduction on her. Saying she's evil, that she came back wrong, that she will never be normal, that she belongs in the darkness with him & not with her friends. All of these things made Buffy hate herself, and feel shame. But regardless, that's what Spike wanted to be true, and he convinces himself and tries to convince Buffy that she's evil just like him and living in denial about it. He doesn't respect her boundaries, nor does he care that his actions fuel her self-hatred. He wants her, and he's doing what he can to seduce her into the darkness with him. He wants her at the expense of her self-respect & sanity. He's not thinking about what she wants, nor does he care. What matters is him having her, by any means necessary.
Finally, after speaking to Riley, Buffy finds her strength. She admits she can't be hard on Spike, because he's being who he is. She ends their f. buddy arrangement,, and shows him basic consideration for the first time -even calling him William. She also admitted point blank that she was being weak & selfish by using him, and being that way was killing her. But he couldn't take that for an answer. he still had to follow her around to ask why she won't sleep with him again, and she bluntly tells him because she doesn't love him.
Once again, having no respect for her boundaries or what gives her real strength, he tells her she's just lying to herself when she says she doesn't love him. He WANTS her to love him, so he's already convince himself that she does, and anything less that an admittance of that is just her lying. He's the one in denial, but can't accept that he is, and tries convincing Buffy that it's really her who isn't being honest with things. This is a classic thing even in real life. On many advice forums, it's usually women. But they tells us about how a guy treats them. And it's obvious to everyone, but them, that the guys don't love them. But they have rationalized the behavior to perfection, so they can still come out seeing what they want than admit they're only being used and their feelings aren't reciprocated to the extent that want.
It's not just Spike. BOTH he & Buffy were mutually selfish. Both had their own stuff going on, and were thinking about what they wanted, not each other. Which is why I believe Buffy when she says her feelings for Spike are not love.
Also, look at how he acts with Xander, Riley, and Angel. He talks about her like something he won. When Riley shows up in his crypt, Buffy is clearly humiliated, but Spike doesn't care. He finds the situation humorless, than takes a childish bragging stance on how Buffy's shagging him now, and claiming she was thinking of him when she was with Riley. Then he blabs to Xander about how he was good enough for Buffy when she clearly never planned for him to know that. But again, what Buffy wants is irrelevant. Long as he gets to use her as a trophy to stick to Xander. Then saying to Angel how Buffy wasn't thinking about him with all the shagging they were doing. He didn't speak very respectfully about the woman he claimed to love. And this was AFTER he had a soul. lol
Then him having Buffbot definitely showed a bad image. The robot looked like Buffy, but was nothing like her. It was a passive sexbot that did whatever Spike wanted. And that isn't the real Buffy, showing that he liked the idea and fantasy of her. But he wasn't appreciating her for who she really was.
So I by default say Angel loved her more, because I don't think Spike loved her at all. He saw her as desirable, and treated her like a prize & subsequent trophy to show off to every man in her life. Plus, not like it doesn't help his rep. Killed 2 slayers, then screwed one over to the dark side as his mate.
Now for Angel, I see his feelings as love because he cared about HER. He didn't showboat or parade her around. he cared how Buffy felt about things. And he tried to do what was best for her, regardless of what he wanted. Like college. She didn't wanna leave SD because of him. She doesn't tell him that, but asks what she should do. Angel tells her she should leave because it's a good opportunity for her. He didn't want her to go. But in that moment, he was thinking about things that could help make her life better. He wasn't giving advice based on his desires. If you put Spike in that position, he'd have told her college is stupid, and how she's not college material anyhow, simply to avoid losing her.
In IWRY, Angel gave up his humanity, happiness, and chance to be with Buffy to save her life and others'. And I think that moment alone was more than anything Spike ever did. Angel expected nothing but the saving of Buffy's life by going back to the Oracles. Contrasting to Spike doing things then expecting praise and rewards for them.