Kabuto probably takes it whether it's with Edo Tensei or not to be honest.
Without Edo: DSM Kabuto is faster, stronger and has more powerful Ninjutsu/Senjutsu he takes this one easily especially considering that Itachi > Orochimaru and Kabuto took on both Uchiha brothers and might have won if Itachi hadn't been Edo (Could atleast beat Itachi in a 1v1 whether people admit it or not).
With Edo: Kabuto definetly takes this one too. Since Orochimaru can't control Hashirama he only truly has 3 edos... On the other hand Kabuto has 25 or something like that and that includes 4 kages + Itachi and NAGATO!! Don't underestimate Edo Nagato, having him on his side is a huge advantage for Kabuto.
So i'd definetly say Kabuto takes it:
DSM Kabuto >>> Orochimaru
Edo Itachi >>> Edo Hiruzen (From what we've seen

)
Edo Nagato >>>> Edo Tobirama
And seriously no matter how much you overestimate KMC Minato you can't deny that he can't beat 4 kage level shinobi when atleast 3 of them are high kage level.