I have known people that use Campy because they think it's All That. Bling, bling, you know?
Then there are those Shimano Sissies too.
Personally, I use neither. When I bought my titanium/carbon/zercon alloy frame for $45,000.00 dollars I made the decision to study engineering, aerotech design and stress philosophies and after I obtained PhD's in all these fields I simply began making my own components in my garage in my spare time.
Go "Homemade" I say... it's cheaper.