Xander on Kirk: Forget Buffy, Xander would like to date Kirk. Okay no, that's an exaggeration, but Xander thus far approves of Kirk as a boyfriend choice. He's always been a champion of Buffy not dating UNDEAD FIENDS, so the fact that Kirk is human earns him points-- as well as the fact that he captains a freaking SPACESHIP, which appeals to all his nerd tendencies. Admittedly there's some wariness, because he's very protective of Buffy, but at the same time he recognizes that it's not REALLY his business, and he's willing to give Kirk the benefit of the doubt- provided he stops pissing Dawn off. Ahem.

Xander on Angel: Not a fan. Never has been, never will be. Xander fundamentally distrusts Angel, and more or less thinks that he's a ticking timebomb of woe and disaster. All of this dates back to Xander's crush on Buffy/jealousy and then Angel's subsequent soul-losing rampage. He has never liked the guy, and Angel hasn't given him any reasons to change his opinion. The fact that Angel is now dating Cordelia doesn't help-- not only is Cordy his ex, but he thinks Angel will end up hurting her, just like he did to Buffy. In short: dislike. Lots and lots of it.