If Orochimaru is alone, Nagato has this. However, Orochimaru has in his arsenal, the four Edo Hokage', which give him the match.Nagato's wins this.
Nagato took on the 2 strongest jinchuuriki and itachi and almost won (if naruto wouldnt have shared info with itachi). Nagato has proven that there are very few who can stand against him.
If Orochimaru is alone, Nagato has this. However, Orochimaru has in his arsenal, the four Edo Hokage', which give him the match.
You are right. I was only considering Orochimaru by himself. But if ororchimaru uses the edo hokages, then he wins this. The hokages are too strong for anyone.
And the combination of 4 hokages plus orochimaru is overkill