Originally posted by: anphorus
I'd go for Orochimaru.

For one thing he killed the Third Hokage who was said to be the strongest of all the Kages not just the Hokages.

For another with Sasori it boils down to the fact that he was beaten by a Chuunin and an Old Woman. The Old Woman may have been strong, but Her+Sakura<<<Sarotobi in my opinion.
Sarutobi wasn't the strongest of all kages. He knew all of Konoha's jutsu's and because of that he was called the professor. Orochimaru only won because:

a) Sarutobi was old, Oro even said, if Sarutobi was 10 years younger he wouldn't stand a chance. Watch the episode.
b) He had to fight off 2 previous Hokages plus Oro who was his subordinate.

As for Sasori loosing, you'd prolly lose too if you had to fight your master who taught you everything you know. Masters teach their subordinate stuff but not everything they know incase of problems like this. Sure he could conjure up 100 puppets and a kazekage with the deadliest sand jutsu but he still lost to his master and she was controlling a walking powerhouse (Sakura) half the time cos she doesn't know anything about Sasori's fighting style. Sakura would be owned in a second if it wasn't for the old lady. Plus Sakura had medications incase of being hit by poison. Plus the mind games with using puppets of Sasori's parents. Again, if the old lady was like 40 years younger, she'd prolly won't need any help against Sasori cos she'll be younger and stronger.

Going back on topic, I think it would be a close fight and I like both of them and can't really say who would win.