What is the advantage and disadvantage of different inner sharp of brush filament?

What is the advantage and disadvantage of different inner sharp of brush filament?

l Solid: Advantage: it is softer tip and Smooth

u Disadvantage: Heavy and not much good painting absorption

l Mini Hollow: Advantage: Good Pianting Absorption and light

n Disadvantage: Rough

l Cross-section: Advantage: Good Painting Absorption

n Disadvantage: the body is hard, not softer.