none of them are stronger, persay. and all of them are stronger. Tsunade is stronger than Orochimaru, Jiraiya is stronger than Tsunade, and Orochimaru is stronger than Jiraiya. That's the whole point of the three sanin. but if I had to pick one and only one, it would probably be Tsunade. simply based on what we've heard in the show and on the manga, Tsunade seems to be the strongest. Tsunade beat the crap out of Orochimaru, understandibly his arms were hurt, but then again he had already stabbed her several times, she had been hurt by Kabuto, and she used up a lot of chakra to try and recover. as for Jiraiya, he himself stated there were only two times he's ever came close to death, once fighting the Kyuubi in Naruto and once when Tsunade got pissed off at him for peeking at her. and of course you might say he was holding back because he cared for her, but I'm sure she wasn't going all out either. And keep in mind these two times he's been near death include all the fights he had been in, such as against Hanzou, and when he was implied to have fought Orochimaru when he left. but that's just my two cents. I'm sure most people won't agree because Jiraiya is the NB house favorite.
