Takes place next to the Caspian Sea. They can't go into the water. No death. Team 2 morals off. Team 2 bloodlust. Kisame has his sword. Provide reason. Team 2 has 5 hours prep.
Tobirama is featless aside from making a darkness aura before getting oneshotted by the 3rd as a zombie.
Kisame's pretty damn powerful, but his chakra absorption is pointless against team 1. I think he'd be a pretty solid fight for either, but without knowing what Tobirama can do, I have go side with team 1.
5 hours of prep? Really? Arthur and Namor teaming up near the water is bad enough, but giving them a few hours to grab Atlantean technology makes this an ugly stomp in their favor.
Both Aquaman and Namor have punched out and held their own against class 100s.
If this is pre 52 Aquaman, he gives them both a seizure.
Kisame solo he is unbeatable with Samehada he also has too many powerful techniques.
I highly suggest you check the feats of the opposing team.