Divided in colors, GuyKyle is red, GuyJohn is green!
Since I'm VERY picky with fics and I'm currently in a HalKyle Only mood, I haven't read any fics with either of these ships though I would like to!
GuyKyle, I think they have So Much content in canon already, like when they went to live together in Oa, or Guy absolutely losing his shit when he thinks Kyle d-words, so I can honestly see them both as a romantic or as a friendly ship, you know? They can rock EVERYTHING.
GuyJohn is like: yes please, where do I sign??? and Guy would drive John crazy but in a good way, and they'd be so good they would become the one true power couple to rule them all.