League of Extraordinary Gentlemen vs The Watchmen
First and foremost, Dr. Manhattan is not in this fight. That would make it spite.
OK, so the LXG and the Watchmen square off in Times Square, to the death.
Team LXG:
Alan Quartermain (armed with a repeating rifle and two revolvers)
Tom Sawyer (same as Quartermain)
Dorian Grey
Mina Harker (in Vampire form)
Rodney Skinner
Captain Nemo (Armed with his sword)
Dr. Henry Jekyll / Edward Hyde (In Hyde form)
Team Watchmen (they have all their weapons from their movie, save Nite Owl's ship):
Ozymandias
Nite Owl
The Comedian
Rorschach
Silk Spectre II
As stated fight takes place in a vacant Times Square at midnight. Both teams have limited knowledge of each others powers. 30 seconds prep time.