The lack of a 90 degree turn exiting the carb helps reduce the need for manifold heat, or so I'm told.
Webers (not that farmiliar with DCOE's ) can generally be tuned more closely to the engine (supposedly why they have a rep as being 'hard' to tune, it's easier to get lost).
FWIW the hard turn inside the heads of some of our types of engines (or blocks if their flatheads) should get enough heat from the cooling system (and the exhaust ports coming out on the same side
) as it is.
