I have Campy Super Record 11 sp and Shimano DA 7800 10 sp. It's taken me a while but I've finally gotten the Campy tuned in and shifting well. Just my experience but both shift very reliably. The Shimano is a smoother, quieter and easier (pushing the levers) shift than Campy. Campy is noisier but just as functional. The shifting from the small ring to the large ring is just a little slower on Campy than Shimano. The chain on the Shimano seems to move from the small to the large chainring with minimal movement of the crank but you really need to turn the crank a good bit to get a good shift with the Campy. The Campy rear shifts about the same as the DA but maybe a little noisier.

I will say that the Campy Ergo shifters are head and shoulders better than Shimano from a comfort perspective. They are wonderful.

I like them both but if I were building up a new bike I'd give the lean to Shimano.