Think I recognise that one! How's it going?
In answer to the original post, this is probably one of the oldest yet never-to-be-bottomed-out questions in cycling. I have used Campagnolo since I started riding. You are either one or the other.
Some of the traditional views that still hold true:
Campagnolo wears in, Shimano wears out
Campagnolo is analogue, whereas Shimano is digital
Campagnolo favour carbon, whereas Shimano favour alloys
Campagnolo is rebuildable, Shimano is disposable
Campagnolo is just plain better than Shimano - ooops, that's just my view!
Shimano is perhaps better engineered, but Campagnolo has more soul (think Ford vs Alpha Romeo)
Campagnolo has a bit of exclusivity about it as it isn't OEM equipment on many bikes, but Shimano spares are more readily available
I have used pretty much every incarnation of Chorus, Record and Super Record including electronic. In fairness, it probably works no better than Shimano, but just different. Shifting is a bit more firm, lever shape suits my hands better and generally I feel that Campagnolo bearings are smoother than Shimano.
It really is a matter of trying it for yourself and making a decision based on feel. Both are well made, functional and beautiful in their own way.