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Who wins?

Bandon throws him into a computer console.

I'm going with Sion.

He has beaten Lonna Vash, who was Jedi High Council Member. He's also slain numerous Jedi, to the point where he became a feared lightsaber assassin:

"Darth Sion has vanquished many Jedi foes."
―Source: Knights of the Old Republic Campaign Guide

"A feared Lightsaber Assassin, Sion's chaotic wrath is directed towards Sith and Jedi alike."
―Source: Insider #88: Heritage of the Sith

He's also one of the strongest Sith of his time and one of Surik's most powerful enemies:

"Only by fighting your way through the Sith's strongest guardians can you earn the right to confront your nemesis."
―Source: Knights of the Old Republic II: The Sith Lords: Prima Official Game Guide

"At last, you have defeated your most powerful enemies and can finally rest and take comfort in the fact that the Force itself is safe from Kreia and the Sith (for now)."
―Source: Knights of the Old Republic II: The Sith Lords: Prima Official Game Guide

Sion easily drains/crushes him.

Can people stop ****ing calling Sion a "Lightsaber assassin"?

Like yeh, I know it's my fault for putting that quote into circulation, but it sounds ****ing retarded

Sion's shit but not this shit. He wins

Lol, Sion.

Sion beats Bandon handily.

Feats

Originally posted by chingchangwalla
Sion's shit but not this shit. He wins
Dunno, man. Sion lost to Atton. This might be closer than you think.

This battle couldn't be more irrelevant.