Far greater chance of carbs via long dual cables going out of synch than with a splitter. Longer cables take different paths with different radii, therefore possibly changing the effective movement at the slide end. Far less chance of this happening with the short cables from the splitter. Not to mention the greater overall friction involved. It's not much, but while we're at splitting hairs... 
Splitters, as well as the short cables, do appreciate a couple of drops of lube now and then, Paul.
piet
Splitters, as well as the short cables, do appreciate a couple of drops of lube now and then, Paul.
piet