If you could only keep one, which would you retroactively erase from continuity? Superman or Batman?
I love 'em both equally but I gotta think I'd have to zap Batman with my eliminator ray. The universe and the four-color comic book world needs Superman. I think it could get by without Bats.
Of course that would mean that others would vanish too (guilt by association) such as Robin, Batgirl, The Joker.....hmmm maybe I should rethink this