You vote for the one who you like more, not's who's the strongest one in a fight and have fun:
General Zod vs. Mr. Majestic
Madame Xanadu vs. Hugo Strange
Captain Comet vs. Despero
Gypsy vs. Mirror Master (Sam Scudder)
The Atom (Ryan Choi) vs. Cheshire
Black Manta vs. Maul
Colossal Boy vs. Monsieur Mallah
Wildfire (Drake Burroughs) vs. Houngan
Steel (John Irons) vs. Metallo
Karate Kid (Val Armorr) vs. The Brain
Mongul I vs. O.M.A.C. (Buddy Blank)
Harley Quinn vs. Zealot
Star Boy vs. Warp
The Ocean Master vs. Grifter
Aqualad (Kaldur'ahm) vs. Count Vertigo
Ferro Lad vs. Gemini
Obsidian vs. Brainwave (Henry King, Jr.)
Shrinking Violet vs. Plasmus
Jonah Hex vs. The Ventriloquist (Arnold Wesker)
Green Lantern (Arisia Rrab) vs. Dr. Polaris (Neal Emerson)
Orion vs. Kanto
Bane vs. Midnighter
Green Lantern (Salaak) vs. Toyman (Winslow Schott)
Cassandra Cain vs. Mantis
Firestorm (Raymond & Rusch) vs. Killer Frost (Caitlin Snow)
Psimon vs. Mercury
Blue Beetle (Jaime Reyes) vs. The Gentleman Ghost
Copperhead I vs. Lobo
The Mad Hatter (Jervis Tetch) vs. Klarion the Witch Boy
Poison Ivy vs. Voodoo
Brainiac 5 vs. Garguax
The Creeper (Jack Ryder) vs. Maxie Zeus
Jinx vs. Lead
Black Adam vs. Spartan
Mammoth vs. Iron
Jesse Quick vs. The Top
Clayface (Basil Karlo) vs. Warblade
Gizmo (Mikron O'Jeneus) vs. Tin
Superboy (Kon-El) vs. Rampage
Katana vs. Talia Al Ghul
Shimmer vs. Platinum
Manhunter (Kate Spencer) vs. Lock-Up
Frankenstein vs. The Key II
Enchantress vs. Man-Bat
White Lantern (Kyle Rayner) vs. Superboy-Prime
Blue Devil vs. Kalibak
Etrigan the Demon vs. Desaad
Captain Boomerang (George Harkness) vs. Max Mercury
Andrew Bennett vs. Parasite (Rudy Jones)
Dr. Light (Arthur Light) vs. Gold
Cosmic Boy vs. General Immortus
The Nightmaster vs. Amazo
Saturn Girl vs. Goldilocks
Mr. Terrific (Michael Holt) vs. Roulette (Veronica Sinclair)
Kid Eternity vs. The Psycho-Pirate (Roger Hayden)
Timber Wolf vs. Elephant Man
Black Orchid (Alba Garcia) vs. Livewire (Leslie Willis)
Red Lantern (Guy Gardner) vs. Mr. Mind
Dream Girl vs. Phobia
Magog vs. The Cheetah (Barbara Minerva)
Kid Flash (Bart Allen) vs. Weather Wizard
Isis (Adrianna Tomaz) vs. Green Lantern (Tomar-Re)
Dr. Occult vs. Anti-Monitor
Bizarro vs. Apollo (Andrew Pulaski)