I think there's a bit more to it than simply masthead vs fractional or asym vs sym. Hull forms, rig geometry, sprits, poles, weight all factor in. It's difficult to be categorical about either one - so much depends on the many variables.
This is true, we are making some gross generalizations here,
while in fact there are many variations on the theme.
Some Masthead rigs use runners, or check stays,
some Frac rigs do not have runners, some do not even
Not all Asymetric spinnakers are flown on a centerline sprit,
or tacked to the bow.
For a displacement boat offshore, the fastest set up is an
A kite, on a conventional pole.