Campag is slightly different in use so that some people will prefer it while others will prefer Shimano or SRAM. It’s a preference.
Some people believe that riding Campag is somehow more ‘real’ and that because it’s Italian it’s got more soul than Shimano or SRAM
Some people believe that Campag wears in. IMO, it’s just stiffer in function when new (eg shifters) but the drivetrain itself wears out about the same.
Some people believe that Campag looks nicer (read less industrial/functional/technical)
Some people believe that Italian bikes MUST have Campag. Interestingly Italians generally don’t believe this and have no issue putting SRAM or Shimano on a classic Italian frame.
There’s a lot of BS about it. By all means use Campag, just don’t kid yourself that it’ll really make any difference to your riding.
(Long term Campag user here, I just like the way it feels)