Robb Stark
King in the North
Plus it just makes sense for the Slayer to be stronger than a vampires, plus we've never seen a vampire beat a slayer fairly.
Boxer Rebellion slayer was killed becasue an explosion distracted her and Kendra was put into hypnosis. The closest is Nikki, but even then it's something that happens when the train goes dark, could have distracted her.
This doesn't really matter. You can say "oh well she got distracted so it isn't clean". That's irrelevant. She did get distracted, Spike didn't, and she lost. Just like how Angelus could have killed Buffy at least four or five times. He didn't though, and he lost. "Could have" or "would have" don't matter. That's combat. Spike beat both Slayers in excellent fights. No need to try and lessen it 🙂.
But then again, like you said, fighting is hardly all about strength. In that area, Buffy looks to be stronger than almost all vampires, with one or two exceptions.

