Originally Posted by Sheldon Brown

Could you be more specific?

How many ways are there for a crank to be "superior?" They're not lighter, they're not stiffer, they're not stronger... May be prettier...

They also commonly use the semi-obsolete 144 mm bolt circle, for which chainring selection is rather poor and the rings available tend to be unreasonably expensive due to their rarity.

Sheldon "Cranks Don't Really Know Where They're Being Ridden" Brown