Yeah, hard telling over time which will be the more desired. Man of Steel #18 used to the THE book to get, but now look at Man of Steel #17 sales, and that's just a cameo.. This is a hobby, not a science, although if a science, I'd at least get a passing grade.
Looks like the market has decided it's Doomsday's first appearance. They should do the same for Damian Wayne, Darkseid and Venom/ Web of Spider-Man 18 ( Just kidding about this last one. Even I don't think a hand is a first appearance )
You're talking all kinds of crazy