Yoda easily. No argument needed really, Jacen is far too inexperienced to fight somone of Yodas caliber even if he does perhaps have a higher potential.
Even if it were TUF Jacen Yoda would take him. I assume that this is Jacen at his peak in Traitor, which I believe is when he is surrounded by the Amphistaffs. Even then, I can see Yoda taking him.
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BS. Let's see your support. And claiming that he became the force avatar doesn't mean anything, as that alone doesn't mean he'd defeat Yoda, nor doesn't it even mean that it made him especially powerful. It could very well mean that he had increased ability to urinate far distances, nothing more.
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That wasnt due to his power, it was due to the force choosing him as a conduit. Jacen says himself he would never be able to repeat the feat, and disregarding that one feat, there is nothing to suggest Jacen would have a chance against a 900 year old *epitome of the light* jedi master.
You thought that I would say that doesn't prove anything? Good.
That doesn't mean that he is now powerful enough to defeat Yoda. What do you think Ben did when he became one with the force? I doubt you would call Ben's force ghost strong enough to defeat Yoda even though he had fully merged with the force.
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Read my post, it explained why Jacen could become one with the force, it was entirely due to the circumstance of the force *choosing* him...not Jacens own power.