Campagnolo's MTB line was short lived, and I think it was called 'Euclid' if I'm not mistaken. Think it was in the early 90's when they had that.
I've had road bikes all my life and Shimano makes some real junk in their low end components. Their higher end components like "600' and later 'Ultegra', and of course 'Dura-Ace' was some really good stuff. Nothing like their low level parts. On the other hand Campy's lowest level components were significantly better than Shimano's low level components. I still have a set of Shimano '600' hubs and they look like bike jewelry. Today Im using campy 'Record' hubs, and they are works of art, as well as the 'syncro 2' DT shifters I have on my bike.
IMO campy will always be better because road bike parts is all they make, right there in Vicenza Italy. (I use to live nearby in Verona.)
Shimano makes fishing reels, so the "passion" will never be on the same level as campagnolo.