the amount of BS and fail in this thread is UNBELIEVABLE.
Let's start with the thread title... shall we ?
Tsunade is spelled incorrectly. The OP spelled it Tsunadae...
Second off,
If people actually click on the link that connected the three sannin with their summons together, they would realize that they are pretty much equal... each having their own advantages and disadvantages against each other.
Third off,
If one does not want to accept the wonderful paragraph the link has provided us with, then one can just babble on about either of them, since you can't prove with 100% certainty either side.
Lastly,
I am reading posts that say Tsunade doesn't have a chakra reserve, or that jiraiya has the most just because or that because oro was afraid of itachi, jiraiya would win because itachi was afraid of Jiraiya and more BS. Really, go read the manga and reread what you type before you click Submit Reply, to make sure a person with a mind can understand what you mean.
Those who say Oro would win, here's what you would argue:
I do not Doubt myself when i say that if orochimaru had his ninjutsu when fighting jiraiya or tsunade, he would destroy them both.
He has a lot of forbidden jutsu memorized, and when he was in his prime he did amazing things... the third even said that he was afraid there is no one strong enough to take down orochimaru other than himself. This was before oro got his ninjutsu taken away.
Oro can use triple rashomon which is an insanely awesome forbidden ninjutsu technique that can withstand the most powerful attacks.
Also, through his countless rebirth techniques, i'd say oro could never have died... therefore he would only be vulnerable to genjutsu.... as shown through itachi's mini encounter with oro through sasuke.
However, one can also counter this argument by saying that Jiraiya has hermit mode and can use multiple offensive and defensive attacks at the same time.
Jiraiya's chakra reserve is shown to pretty massive (as shown through the fight with Pein) and he is usually successful in most planned attacks if no one helps from the outside... Example: Frog song when dealing with pein. The only way they broke through it was by pein's other paths.
Jiraiya can use frog katas so he has pretty good taijutsu... better than oro most likely. We haven't really seen oro use any major forms of taijutsu going on... he uses mostly ninjutsu.
Jiraiya also can summon gambunta and the stomach of a frog to trap oro since oro can't use amaterasu.
Now, with Tsunade it is a tough one... why ? Because she isn't trained to fight battles like Jiraiya and Oro, she is trained to parry, dodge, and heal herself and others, while offering a considerably good offense.
She can instantly appear behind Oro and use Rashinsho... which has been proven to be deadly. Only elite medical shinobi can find a way around that.
She also has her genesis rebirth technique and given that she can store chakra and let out massive amounts without affecting her battle style, i would say that she is someone you do not want to mess with.
The outcome of a battle relies mainly on three aspects:
chakra reserves... i would say as shown through the attack on konoha and the fight with oro she has the most chakra out of the three sannin. She can store incredible amounts of chakra and let it out with ease, and can use it to save hundreds of people.
intelligence... i would say a tie between orochimaru and Jiraiya. oro was regarded as a genius when he was in his prime and even before that. I don't need to elaborate further. Jiraiya is smart and has been shown to be able to plan and corner his opponents (as shown through the fight with Pein).
sheer power... i would definitely say Jiraiya. Why ? Because He can Friggin demolish you if you are not paying attention. He also has HM and his ultimate rasengan which is a one hit Kill. Also, Jiraiya can use pretty devastating attacks such as deep fryer. He can also regenrate his health and use nature to destroy his opponents.
So in the end, if i am one who doesn't go by the Rock paper scissors logic, i would have to say that Jiraiya would take home the gold because he has intelligence, power, and a good enough chakra reserve to last him through a pretty long fight.
HOWEVER i DO go by the logic that Rock beats scissors, scissors beats paper and paper beats rock and therefore believe and have to come to a conclusion that one cannot know for sure whether one of the sannin are stronger than the other, since they each counter each other in different ways.
Unless Kishi says so of course.