I see a few scenarios with both of them beating the other. However, I think Nagato wins more times than Kabuto would.
Kabuto has a decent shot at victory, but is the clear underdog
I really hope you guys are talking about kabuto starting in DSM, if so then I agree.
B/t before kabuto can enter SM, easily.
If kabuto starts in SM then it becomes a different battle however cbt still crushes him.
Kabuto easily counters BT with his non sage art abilities (Suigetsu's hydraulic thing, sound genjutsu, hiding like a mole no jutsu, Kidomaru's spider thing, oral rebirth (yes even without sage mode Kabuto has better stamina than hebi sasuke so he can do it))
Lol? Hanzō dodged that, Kabuto would make a joke out of it.Nagato can use the Gedo + The Phantom dragons.
This is instant death for anyone, even Kabuto.