your advice?: Giant cadex shimano 600 vs Cascarsi Campagnolo chorus

I'm looking for an affordable second hand bike.
I have to choose between two bikes.

which one is the best? assuming both groups have run an equal mileage

Giant cadex with shimano 600 group
or
a cascarsi (don't know the type) with a campagnolo chorus group.

What would be a reasonable price in your opinion?

THanks

Jp