ORIGINAL: inverted flyer
in lab conditions ie. no wind whatsoever (or just a steady consistent drift) then there is no argument - lighter will fly better, smoother, slower, more graceful and more responsive,
Not necessarily true...
Wad up a piece of paper and throw it. Now throw a baseball.
I would prefer a plane that penetrates the air.
I have said for many years that heavier planes fly better (Within reason of course)
Now, if you WANT a plane that will float along on a breeze, or do 3-D, then yes, lighter is better.