I find Buffy/Xander more interesting in storytelling. They're a little different, which would make it a fun match. Xander/Dawn is a little too similar for my liking.
But Buffy never experienced being unnoticed, it is hard when you work with everybody and don't get appreciated or seen. Buffy will always be looked up to, everybody respects her and regards her with value. Xander, on the other hand, is always looked down on and always seen as a damsel in distress, someone who needs to be protected. It saddened me when I read plenty of comments when S8 first started about Xander not fitting to be Buffy's second in command -because he doesn't have powers.
As an aside, that speech has always bugged me, Xander says something like 'how much harder it is for the rest of us' which I just don't agree with. Buffy's life was 10 times harder than anybody else's on the show in terms of what she had to go through.
But Buffy never experienced being unnoticed, it is hard when you work with everybody and don't get appreciated or seen. Buffy will always be looked up to, everybody respects her and regards her with value. Xander, on the other hand, is always looked down on and always seen as a damsel in distress, someone who needs to be protected. It saddened me when I read plenty of comments when S8 first started about Xander not fitting to be Buffy's second in command -because he doesn't have powers.