Hello Campagnolo.
Shimano are made to feel sweet in the shops, but wear out more quickly. They change standards every year, and spares for older components (eg correct cones with seal) can be very difficult to get. Their systems are designed to work well, but not to last.

Campy are built to wear in and work better after a bit of use. Their support for spares is much better, and their gear lasts longer. In the top of the range hubs, for instance, the cups are replaceable, so the hubs never really wear out.

Campy has a special place in the hearts of true roadies. Shimano: they make really neat fishing reels.