1. Well, Vodo doesn't use a lightsbaer, but if he gets his walking stick vs. Arca's saber then Vodo likely wins. He gave Kun a great fight the first time they fought, after all.
2. Arca by default, since we've never seen Vodo use the Force (that I can remember).
3. Vodo wins. As stated before, he gave Kun a great fight the first time that they fought. He's also a Jedi Guardian. Arca, on the other hand, was nearly killed by King Ommin.
Well, Wookieepedia says that Vodo is a Jedi Guardian, and says that it says that in Power of the Jedi (a sourcebook).
http://starwars.wikia.com/wiki/Jedi_guardian
However, it also lists Arca as a Jedi Guardian, so it doesn't really matter.
Wookieepedia is a viable source if the claim can be supported by a source, Makashi. If it says Vodo is a Guardian and backs it up with the Power of the Jedi RPG Sourcebook, then it's correct.
However, it really has no effect on any Vs. thread ever.
Anyways, I say Vodo. I think the reason his staff could survive a lightsaber blow was because of some Force technique he used. I read that somewhere, can't remember where, so I won't say that's what it was. But seriously, what kind of wood can survive a lightsaber blow? ermm
Wookieepedia is a viable source if the claim can be supported by a source, Makashi. If it says Vodo is a Guardian and backs it up with the Power of the Jedi RPG Sourcebook, then it's correct.
It's correct that the Sourcebook states as such, but since RPG sourcebooks are filled with info and game statistics typically fall into N-canon, which is filed along with Infinities, if that tells you anything.
Basically, it has no direct bearing on anything here.
But seriously, what kind of wood can survive a lightsaber blow?
Vodo tricked Kun and gave him a training saber. Then he told the whole world he could block a lightsaber with a piece of wood.