Obi-Wan's designed to fight these ham-fisted, aggressive styles, so yeah, he'll probably win sabers. Especially if even RoT Zannah could fend off Bane's strikes. Obi-Wan's familiarity with Djem So will help him here.
For Force, Bane's oft-cited feat of disintegrating technobeasts is outdone by Obi-Wan disintegrating Durge (yes, I'm aware that he gathered power and Durge was weakened by electricity - but Bane was on a nexus and in the same room as a holocron that was raidating DS energies). Bane does have that gate feat, which would put him above Obi-Wan as a telekinetic, but the main reason Obi-Wan loses Force is that his TK can't even hurt Bane at this point.
Obi-Wan takes all-out, though.