There is pretty much nothing that Slayer offers to me that I'd be interested in, especially in the world where Kreator (or even Dark Angel) exists. I guess if it was South of Heaven in the third pairing, I might've picked that one over a weaker Accept album, but it's not, so I don't. Even a weaker Scorpions album is an ultimately more rewarding experience. Reign in Blood feels like two pretty okay songs and then a bunch of demos sandwiched in the middle. I guess the beginning to Criminally Insane is interesting as well. That'd be 2 anti-Slayer votes.
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As for the Maiden fight, well, there is pretty much nothing on the debut that would interest me bar Phantom, Remember Tomorrow and maybe Strange World, also Di'Anno's way too rad for this trad, that is, too much punk to me liking and the production and general approach also leaves a lot to be desired. Now, with SSOASS I also have a lot of problems, from the POM -> SSOASS streak I rank it definitely the lowest and a lot of missteps abound (whatever The Prophecy is trying to be, the lyrics here and there (and everywhere), the badly synced keyboard choirs on the title track etc.), but the highs are really high and all the way through the album's much more enjoyable.
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Ozzy, 'cause there's much more ideas, fun and playfulness, catchy melodies and Randy there. The Last in Line is great, but more monotonous. And Dio's roar is absolutely awesome, but as always, once the metalheads get ahold of something really great, they just have to adore it to high heavens in such a way it goes beyond the cliche, it gets ridiculous and unpleasant. So I'm actually glad I can vote against him with clear consicence.