I'm generally a ZeroxYuuki shipper and that's the pairing I support and like, despite how unlikely it is. No matter my personal thoughts, KanamexYuuki is "just meant to be".

However, I don't ship, but enjoy ZeroxKaname/KanamexZero. It's canonically possible, but definitely not probably. It all really started as more of an aesthetics thing for me because they're beautiful together [and how can you ignore all those promotional images with them together]... But it kind of evolved into a ship for me, but not really.

ZeroxYuuki for me. For some reason, though I'm also okay with KanamexYuuki, I just enjoy ZeroxYuuki more, but I definitely see where KanamexYuuki fans are coming from and the whole dynamic of the pairing.