Vader's armor isn't immune to lightsaber damage but it does give him some protection,with that in mind I think he could hold off Sids long enough for the pissed off Luke to finish him off.if that happens,the duo wins,but if Luke attacks his own teammate(This is pissed off Luke here) Them Lord Sidious kills Luke or Vader easly,from here the battle can go a lot of ways.But overall I say the duo has this.
Originally posted by jollyjim311
Yes, but ROTJ Sidious is quite good in force, probably better than himself in ROTS.I think Luke deserves a little more credit...
Yea, i also think Luke deserves more credit, i used to think he is rely bad, but OBi-Wan and Yoda, wouldn't have send him to fight Vader and confront the Empire, if they didn't tought he was ready. But then again, they knew he wasn't as powerful as the Emperor, war they hoping he can redeem Vader and both fight Sidious.