Marvel 1 over Fantastic Comics 3 (not even close)
More Fun Comics 54 over Marvel 1 (that Marvel is just too crusty for me at this point)
Detective 27 (7.5 PLOD) over More Fun 52 (6.0): you gotta love the bats and pick up a beautiful copy when you can
Batman 1 (9.0) over Flash Comics 1 (9.6): Batman is more important, better known, and features the 1st Joker and Catwoman. I don't really care who owned or found a book, so pedigrees don't really matter to me.
Marvel 1 (5.0 October) over MMC 9 (8.0): Very easy pick for me here. October is uber-rare so definately that one