I'd argue for Classic covers as well. In fact, I got the classic ones for Tomb of Dracula Vol.2 Omni, Inferno Omni, Silver Surfer Omni and FF Vol. 2 Omni. Unless it's a really cool Alex Ross version (based on the original) like Hulk, Spider-Man and X-Men Vol. 1 Omnis.

I got the variant for Acts of Vengeance Omni because it's Alan Davis. But I think the Ed McGuiness variant for Secret Wars II is really bad. Like one of the pin-ups you find in a throwaway Marvel Annual rather than a proper cover for an Omnibus that cost a hundred bucks!!!

I also ordered the John Cassaday variant for X-Men Vol. 2 Omni because it looks really good.