Originally posted by CogitoRemember, the "several million universes" statement was just in reference to the amount of universes that were colliding around them at any given point-- not the total amount of universes in DC's omniverse.
Does the term matter here? Whether you call it an omniverse or not, it's millions of universes at minimum. That's millions more than either of the other two players here.
But yeah, either way Pandora's feat is still millions of times more impressive than the others'.