Aposcalypse's Bio

Alter ego: En Sabah Nur

Species: Human Mutant

Team affiliations:Four Horsemen
Dark Riders
Clan Akkaba
Alliance of Evil

Notable aliases:The First One, High Lord, Set, Sarau, Kali-ma, Huitzilopochtli, Eternal One

Abilities: Self-manipulation
Immortality
Superhuman strength, speed, agility, endurance, reflexes, and durability
Teleportation
Flight
Energy manipulation
Technopathy
Healing factor
Psionic powers
Genius-level intelligence
Access to Celestial technology

Darksied's Bio

Alter ego: Uxas

Species: New God

Place of origin: Apokolips

Team affiliations: Darkseid's Elite
Intergang
Secret Society of Super Villains

Notable aliases: Dark Side, Boss Dark Side

Abilities Posse:ssor of the Omega Force
Superhuman strength, stamina, durability, and intellect
Psionic powers
Immortality

C'mon a God from the fourth world, and Darkseid "killed" Batman

his on the X-Men!

im gonna say Apocolypse because he was always awesome, even though he kept trying the exact same plan again and again and again and it always failed.
My decision is partially based upon the fact Darkseid was involved in the destruction of some of the things that made Batman one of my favorite superheroes.

Tough one.

Because Darkseid IS!