This is a really tough one. Looking at their power:
Hashirama/Minato:
Hashirama:
Sage Art: Wood Release: True Several Thousand Hands
Summoning: Quintuple Rashōmon
Top Transformed Buddha
Wood Release Secret Technique: Nativity of a World of Trees
Wood Release: Advent of a World of Flowering Trees
Wood Release: Hōbi Technique
Wood Release: Hotei Technique
Wood Release: Wood Dragon Technique
Wood Release: Wood Human Technique
Minato:
Chakra Transfer Technique
Contract Seal
Dead Demon Consuming Seal
Eight Trigrams Sealing Style
Flying Thunder God Technique
Four Symbols Seal
Rasengan
Space–Time Barrier
Summoning Technique (Toads)
Summoning: Food Cart Destroyer Technique
Madara:
Jutsu
Amaterasu
Fire Release: Dragon Flame Release Song Technique
Fire Release: Great Fire Annihilation
Fire Release: Great Fire Destruction
Fire Release: Great Fireball Technique
Gunbai Barrier Technique
Gunbai Fanned Wind
Summoning Technique (Kurama)
Susanoo
Tsukyounomi
Uchiha Return
Obito:
Jutsu
Demonic Statue Chains
Earth Release: Hiding Like a Mole Technique
Explosive Landmines
Fire Release: Blast Wave Wild Dance
Fire Release: Great Fireball Technique
Genjutsu: Sharingan
Human Path
Izanagi
Kamui
Outer Path
Six Paths Technique
Six Paths of Pain
Soul Removal
Summoning Technique (Demonic Statue of the Outer Path, Kurama)
Tailed Beast Extraction Technique
Uchiha Flame Battle Encampment
Wood Release: Cutting Technique
I say Team 1. Minato can summon Toads to handle the the Edo Jins while Hashirama uses Shinnsusenju to damage Madara's Susanno armor and put Kurama to sleep. Minato can also use FTG and use the barrier technique to hold against Obito, since it takes a lot of Obito's chakra to control the Edo Jins.
To sum it up, its pretty much Hashirama holding and taking down Madara while Minato holds his own. Then he comes and help Minato take down Obito.