You vote for the one who you like more, not's who's the strongest one in a fight and have fun:
Ultron vs. Machine Man
Union Jack (Joseph Chapman) vs. Batroc the Leaper
Taskmaster vs. Mantis
Kingpin (Wilson Fisk) vs. Agent Venom
Death's Head vs. Red Skull
Sersi vs. Korvac
Hepzibah vs. Shadow King
The White Fox vs. Lady Deathstrike
Meggan Braddock vs. Tyrannus
Kang the Conqueror vs. Dr. Druid
Jubilee vs. Omega Red (Arkady Rossovich)
Carnage vs. Rocket Racer (Robert Farrell)
Misty Knight vs. Zzzax
Wolfsbane vs. Sauron
Ka-Zar (Kevin Plunder) vs. Fin Fang Foom
Captain Britain (Brian Braddock) vs. Ironclad
Pixie (Megan Gwynn) vs. Sebastian Shaw
White Tiger (Ava Ayala) vs. Kraven (Sergei Kravinoff)
Cable vs. The Absorbing Man
Genis-Vell vs. The Supreme Intelligence
Angel (Warren Worthington III) vs. Unus the Untouchable
Hank Pym vs. X-Ray
Cypher (Doug Ramsey) vs. Avalanche
Scarlet Spider (Kaine) vs. The Rhino (Aleksei Sytsevich)
Apocalypse vs. Shanna the She-Devil
Lilith, the Daughter of Dracula vs. Stature
Sandman vs. Ms. America (America Chavez)
Mr. Sinister vs. Thunderbird (John Proudstar)
Blastaar vs. Hulkling
Rachel Summers vs. Mastermind (Jason Wyngarde)
Blink vs. Selene
Songbird vs. Vapor
Dracula vs. Wiccan
Nova (Richard Rider) vs. Graviton
Shang-Chi vs. The Radioactive Man (Chen Lu)
The Sentry (Robert Reynolds) vs. Psycho-Man
The Black Cat vs. Electro (Max Dillon)
Quasar (Wendell Vaughn) vs. Vector (Simon Utrecht)
Thundra vs. Patriot (Eli Bradley)
Dazzler (Alison Blaire) vs. Proteus
Cannonball vs. Pyro
Blizzard (Donald Gill) vs. Colleen Wing
Thanos vs. Pip the Troll
Strong Guy vs. The Leader
Mystique vs. Sunspot
Trapster vs. Speed
Dr. Octopus (Otto Octavius) vs. Morbius, the Living Vampire
Arkon vs. The Super-Skrull
Wolverine vs. Donald Pierce
Dakota North vs. Bullseye
Star-Lord (Peter Quill) vs. Titania (Mary MacPherran)
Thane vs. Moondragon
Groot vs. The Puppet Master
John Jameson vs. The Lizard
Iceman vs. Scorpion (Mac Gargan)
Emma Frost vs. Harry Leland
Silver Sable (Silver Sablina) vs. Baron Zemo (Helmut)
Warpath (James Proudstar) vs. Cassandra Nova
Ares vs. The Molecule Man
The Wizard vs. Hawkeye (Kate Bishop)
Beta Ray Bill vs. Skurge the Executioner
Warlock (Technarch) vs. The Blob
Chamber vs. Annihilus
Spider-Woman (Jessica Drew) vs. Moonstone (Karla Sofen)