Shifting issues aside, there is the matter of durability and longevity. I think Campagnolo is still the king of durability. "Campy breaks in while Shimano breaks down" is a phrase that is likely still as true today as it was "back when". (I'm still riding on 30+year old Campy gear which has required almost zero repair)
FWIW, the local talk is that a lot of SRAM gear breaks prematurely. Many local roadies and MTB'ers are waiting for the next gen SRAM in hopes they're built stronger.

~Sherry (wishing SunTour was still alive and well... )