Where and when?
10pm in Gotham City. The streets are populated and the characters will begin at the opposite ends of Crime Alley. The Bat team cannot access any advantages such as safe houses, vehicles or other blatantly unfair advantages the home field advantage would offer.
This is a random encounter and they're all in character. Both teams have basic knowledge. Team Bats knows X-23 has a healing factor and that Gambit has an explosive power. Gambit and X-23 know Batman and Nightwing are very skilled humans. Team Bats is pre-52 and Gambit will not use his death powers. Characters are eliminated by all standard methods.
Don't just say "x wins" and move on! Back that opinion up with some sexy facts! Why do you support a side? Have any scans to share? Make these threads an example for the community!