I doubt there is any one answer that fits everybody. My dad had a wrist injury in his 20s that kept him from using a straight stock, I never used anything else if it was up to me. Can’t say I can document shooting one style better than the other, but, I sure like a straight stock.
I don’t hunt ducks, no pass shooting in my world, just flushes from close by by grouse or pheasants, I’m guessing that explains the preference in my case better than anything else.

Best,
Ted