If you're going to do cross-country, deep sections help give you mud clearance and a stronger cross-section.
They have a speed advantage when you're racing.
However both of those are unlikely to affect you when fixed... but hey it's not like discs have any advantage at all when not raced inside or in low wind conditions... so as hippy says, just for looks.
If you're going to do cross-country, deep sections help give you mud clearance and a stronger cross-section.
They have a speed advantage when you're racing.
However both of those are unlikely to affect you when fixed... but hey it's not like discs have any advantage at all when not raced inside or in low wind conditions... so as hippy says, just for looks.