You vote for the one who you like more, not who's the strongest in a fight and have fun:
Spider-Woman (Jessica Drew) vs. Nick Fury
The Wizard vs. Dr. Druid
The Hulk vs. The Leader
Daredevil (Matt Murdock) vs. Typhoid Mary
Fandral the Dashing vs. Thunderball
Tigra vs. White Tiger (Ava Ayala)
Howard the Duck vs. Egghead
Spider-Ham vs. Beta Ray Bill
Invisible Woman vs. Franklin Richards
Wolverine vs. Sabretooth
Unus the Untouchable vs. Psylocke
Emma Frost vs. Stingray
Cloak vs. The Hood
Mantis vs. Karolina Dean
Iceman vs. Skids
Adam Warlock vs. Chase Stein
Patriot vs. The Living Brain
Iron Fist (Danny Rand) vs. M.O.D.O.K.
Shaman vs. The Man-Thing
Banshee vs. Forge
Hawkeye (Kate Bishop) vs. Boomerang
Black Widow (Natasha Romanova) vs. Ant-Man (Scott Lang)
Hercules vs. Namor the Sub-Mariner
Dazzler vs. Shard
Stature vs. The Beetle (Janice Lincoln)
Hellcat vs. The Mad Thinker
Jessica Jones Cage vs. The Purple Man
Sersi vs. Moondragon
Mar-Vell vs. Blue Marvel
Vindicator (Heather Hudson) vs. Lady Deathstrike
Starfox vs. Mockingbird
Angela vs. Molly Hayes
Quake (Daisy Johnson) vs. Mr. Hyde
Professor X vs. Fixx
Blink vs. X-23
Wonder Man vs. Jocasta
Firestar vs. Russel "Rusty" Collins
Balder the Brave vs. The Wrecker
Groot vs. Klara Prast
Venus Dee Milo vs. The Grey Gargoyle
Virginia "Pepper" Potts vs. The Mandarin
Bishop vs. Greystone
Iron Patriot (James Rhodes) vs. Green Goblin (Norman Osborn)
Agent Venom vs. Victor Mancha
Vivisector vs. Tiger Shark
Loki vs. Nighthawk (Kyle Richmond)
Mr. Sensitive vs. The Absorbing Man
Rocket Raccoon vs. Old Lace
U-Go Girl vs. Titania
The Punisher (Frank Castle) vs. Maximus the Mad
Hulkling vs. Overdrive
Ghost Rider (Johnny Blaze) vs. The Awesome Android
Doop vs. Whirlwind
Gamora vs. Nico Minoru
Wiccan vs. The Shocker (Herman Schultz)
Elektra vs. Shang-Chi
Dagger vs. Black Swan (Yabbat Turru)
Dead Girl vs. Madame Masque
Volstagg vs. Bulldozer
Anarchist vs. Baron Zemo (Helmut)
Hogun the Grim vs. Piledriver
Speed vs. Speed Demon
The Black Knight (Dane Whitman) vs. The Red Ghost
Captain Britain (Brian Braddock) vs. Captain America (Sam Wilson)