You vote for the one who you like more, not's who's the strongest one in a fight and have fun:
Superman (Kal-El) vs. Lex Luthor
Hawkman (Carter Hall) vs. Hawkwoman (Shayera Hol)
Starman (Jack Knight) vs. Stargirl
The Flash (Jay Garrick) vs. Dr. Fate (Kent Nelson)
Red Robin (Tim Drake) vs. The Riddler
Zatanna vs. John Constantine
The Question (Vic Sage) vs. Phantom Stranger
Green Arrow (Oliver Queen) vs. Arsenal (Roy Harper)
Batgirl (Barbara Gordon) vs. Joker
Green Lantern (John Stewart) vs. Wally West
Blue Beetle (Ted Kord) vs. Booster Gold
Wonder Woman vs. Donna Troy
Green Lantern (Alan Scott) vs. Swamp Thing (Alec Holland)
Nightwing (Dick Grayson) vs. Deadman
Shazam (Billy Batson) vs. Black Lightning
Supergirl (Kara Zor-El) vs. Martian Manhunter
Green Lantern (Hal Jordan) vs. Star Sapphire (Carol Ferris)
The Flash (Barry Allen) vs. Captain Cold
Black Canary II vs. The Huntress (Helena Bertinelli)
Starfire (Koriand'r) vs. Adam Strange
Aquaman (Arthur Curry) vs. Mera
Animal Man vs. Vixen
Wildcat (Ted Grant) vs. The Spectre (Jim Corrigan)
Deadshot vs. Catman
Catwoman vs. The Huntress (Helena Wayne)
Captain Atom vs. Atom (Ray Palmer)
Green Lantern (Kilowog) vs. Sinestro
Mr. Miracle (Scott Free) vs. Big Barda
Power Girl (Karen Starr) vs. Metamorpho (Rex Mason)
Raven vs. Beast Boy
Red Tornado (John Smith) vs. Darkseid
Batman (Bruce Wayne) vs. Two-Face (Harvey Dent)