Board Thread:Versus Battles/@comment-25735186-20171129173643/@comment-28510017-20171129193852

Batman wins imho because:
 * Summoning of the drones, plus the Batmobile and Batwing
 * Can simply BFR by opening a portal to another universe
 * Dwarf Star level AP vs Solar System level Durability
 * Superior genius and combat master
 * Immortality via regeneration (Low-Mid)
 * Durability negation on magic users and heroes

Dex does have chances to win via sealing, time stop, and having a greater durability, but more often than not, Batman takes the victory imho.