If this has already been mentioned, then I'm sorry; but I believe Oro would've won, hands down. Here's why:

The Yodaime Hokage--The Fourth. I honestly don't believe Sasori had the ability to stop a summoning of that sort. His methods are just too direct. And, I feel confident that The Fourth would school Sasori.

Then again, I really don't think it'd come to that. Orochimaru would probably just take out all of Sasori's puppets with that snake hands technique he just pulled out against Yamamoto.