I'ts basically a Minato vs Kisame
it can go either way
Uhh no it isn't. Orochimaru is a bigger force to recon with than kisame, especially because of hydra mode and manda.
OT: Team 2 should take this. Team 1's best strategy is for tsunade to drop a katsuya on minato to constantly transfer chakra so that he can spam jutsu. Minato would have to take on these two monsters alone. Theorectically, due to his hype, he should be able to take them on individually, but together it's a stretch especially since he hasn't shown enough to warrant how he'd do that.
But, In any case, with an almost limitless supply of chakra(from tsunade who was able to help an entire village) minato can prove very troblesome with a bunch of massive toads, FTG, and rasengans + healing (from tsunade) if they ever actually get a hit on him. The hardest thing for team 2 would be to do damage to team 1 due to FTG(minato can easily ftg tsunade with little effort). But like i said, it would be a hard battle for team 2, even with WD since if only 1 person gets out of the dome, minato can FTG himself/tsunade out also.
My vote is Team 2 mid-high diff.
EDIT: This assumes no ET. Else it would be a complete stomp and team 2 wins almost no diff