Who Would Win?

Mephisto

Lord of a realm of Hell

Demonic Power, Reality Warping, Immortality, Soul Manipulation, Shape-Shifting, Energy Projection, Superhuman Strength

None (demonic power)

Hell-lords, Lords of the Splinter Realms; formerly manipulator of the Six-Fingered Hand

Bruce Thomas Wayne

CEO of Wayne Enterprises, vigilante

Agility, Stamina, Intellect, Weapon Master, Insanely Rich, Power Suit, Unarmed Combat, Gadgets, Escape Artist, Tracking, Adaptive, Swordsmanship, Marksmanship, Stealth, Leadership

Batsuit, utility belt, Batarangs, grappling hook, smoke pellets, Batmobile, Batwing, Hellbat armor, Justice Buster, Final Batsuit

All-Star Squadron, Atomic Knights, Batman and Robin, Batman Family, Batman Inc., Batmen of All Nations, Beast-People, Croatoans, Empire of Shadows, Gotham Knights, Green Lantern Corps, Green Lanterns of The Multiverse , Injustice League, Insurgency, JLAxis, Just'a Lotta Animals, Justice 9, Justice Incarnate, Justice League International, Justice League of America, Justice League Unlimited, Justice Lords, Justice Society of America, Justice Titans, Kane Family, Love Syndicate of Dreamworld, Miagani, Mystery Analysts, New Gods, New Reichsmen, Nimrod Squad, Outsiders, Quinntets, Red Hood Gang, Sons of the Batman, Suicide Squad, Super Friends, Super Powers, Super-Americans, Superman/Batman, Team Entropy, The Guild of Detection, The Light Brigade, The Unknowns, Trinity, Wayne Enterprises, Wayne Family, White Lantern Corps, Wonders of the World, Zhuguan