As to the real people part, since they aren't real people we only have fictional guidelines/numbers to base their abilities on. How else can you decide who would win, other than personal opinions based on wether you like or dislike the particular characters? If its all personal opinion, well, my dad can beat your dad, so there!
If you're going by official SW info then Vader wins.
But that's flawed because Str doesn't always equal a victory.
The stats are also flawed,they use a system that even where you have some characters that are stonger then others,there's still a balance with in the system. The balance is there so any character has a chance to beat another.
And,having the better stats just like with Str doesn't always equal a victoty. Malak always has a great stats,how many people can't beat him?
In short,unless you're using official SW info as a guide,there is no answer. You can't find one and it all comes down too,as you said,personal opinion.