It would have been interesting for sure. The whole nature of the battle would have been different. For me, it just seems that Vader suddenly becomes weak and never really puts up much of a fight to compare with the earlier performances and menace in Empire and SW. I've always thought that there was a good chunk cut out of the final release version (all I know is the part of Luke losing his saber to Vader was cut).

Palpatine is so much more menacing by not using a physical weapon. As a kid I tried to learn Palpatine like pronounciation because it just sounded so evil.

So when it comes down to it Luke vs. Palpy can only be determined by the screenwriter. Is it a happy movie aimed more at kids, or the sequel to Empire Strikes Back?