Darth Exodus
The Gr8est!!!!!!!!
Bane Without orbalisk:
1.Force
2.Sabers
3.All out
Force: Bane has already shown himself to be incredably capable with the force at this time. Some of his feats involve: Showing mastery of Sith lightning after 1 hour at a degree of Darth Sidious (debatable, Destroying the roof of the Lehon temple (much better than what Dooku did in AotC) despite exhaustion from battle and 3 days without food, killing the Master of the best Sith school like he was a bug, overcoming a powerful poison, Beating Kaan's mindpower's, Force pushing hard enough to vaperise bones, surviving the Thought bomb ( through unknown means and of course his planet killing thing.
Mace on the overhand has been able to force crush a non-forcesensitive Grevious's chest and has shown some skill with TK, which isn't that great in combat.
Bane definately wins.
Sabers: Although Bane is very skilled in combat, Mace has the upper hand through his use of Shatterpoint and Vaapad against which Bane has no defence of previous knowledge of.
All-out: Could go either way depending on what happens.
Bane with orbalisk:
1.Force
2. Sabers
3.All Out
Force: Bane has all of the above feats plus an extra 10 years of training, has gained the ability to influence things on a sub-atomic level and has the added boost of the orbalisks. He wins easily.
Saber: With the additional effects of the orbalisks and the extra 10 years, I would put Bane at the very least on the level of RotS Sidious. Mave's Vaapad might spell trouble for Bane but I think not. The way that Vaapad works is that it feeds off the darkside power of Mace and his opponant and creates a super-conductive loop against the enemy, using the darkside against him/her. However, Bane's orbalisks feed off darkside energy thus it is highly possble that Vaapad might well work in Bane's favour instead of against him. And also Mace might not have enough time to find Banes shatterpoint as he had trouble finding Sidious' and Bane doesn't have the distraction of Anakin to create one (which was Sidious' SP in the book). Thus I find it highly probable that Bane can win.
All-out: Bane for the above reasons.