I'm trying to think of a way to do it that actually shows who's the better player.....
that's difficult!!
I wouldn't bother.
You would just make a fool of yourself

Well if you want to do it a more complicated way then a points structure is needed, where you get points for surviving x amount of nights and winning.
If you wanted to go further you could do it for correct lynches and succesful kills etc. but then that is getting really complicated.....
I think nights survived bonus points for being alive at the end and points for winning.
Points for winning should be the most as that is what the game is about and then a decent bonus for still being alive at the end and points for survivng nights the lowest amount of points awarded.
If you make it too complicated its just going to end up tits up and way too much work.