Who Would Win?

Vision

Avenger, synthezoid

Flight, Super Strength, Super Speed, Agility, Stamina, Invulnerability, Intellect, Radar Sense, Blast Power, Healing, Invisibility, Phasing / Ghost, Chameleon, Shape Shifter, Implants, Power Suit, Unarmed Combat, Gadgets, Adaptive, Electronic interaction, Holographic Projection, Electronic Disruption, Levitation, Duplication, Omni-lingual, Time Travel, Heat Vision, Density Control, Energy Absorption, Energy Manipulation, Berserker Strength, Leadership

Solar gem (forehead), vibranium-laced body, density manipulation hardware

Avengers, Avengers Unity Squad, Avengers West Coast, Cosmic Avengers, Dead Avengers, Defenders, Galactic Guardians, Guardians of the Galaxy, HYDRA, Infinity Watch, Iron Avengers, Nexus Beings, Outlaw Avengers, Project PEGASUS, Secret Avengers, The Galactic Avenger Battalion, The Machine Resistance, The Vi-Locks, The Visions, Weapon X, Young Avengers

J'onn J'onzz

Detective, Justice League member

Shape-Shifting, Telepathy, Superhuman Strength, Flight, Intangibility, Invisibility, Martian Vision, Regeneration

Martian technology (rarely used — relies on innate powers)

Darkstars, Justice League of Aliens, Justice League Of America, Justice League Task Force, Justice League Unlimited, Martians, Outsiders