If you assume Batman can prepare it's an interesting fight but I agree. It'd be cool to see:
https://www.youtube.com/user/screwattack
Do that battle instead since they give the debate justice instead of having comicon nerds vote and then making a very cool video of it.
The big thing that Super Power Beat Down missed was the fact that Vader can use the force to detect Batman and Batman's intent. To me this is the bigger threat more than force choke, lightsabers etc. Much like the spider sense that spiderman has vs batman in their screwattack deathbattle. All the gambits that Batman would've prepared to defeat Vader could be easily shown to be unraveled by the fact that Vader would sense it. This sort of assumes that the writer of the fight would account for that, and the force is a traitorous bitch (aka not written evenly). Otherwise like the video Batman is one EMP from beating Vader at any time.
But if Batman can unlock superman it's game over for Vader, much like the video showed.