The Wikipedia article at
https://en.wikipedia.org/wiki/Campagnolo has a fairly comprehensive timeline of what groupsets came in when, although even in there some names disappear only to re-appear 20 years later, or be used again as a re-name of a different groupset, which can make things slightly more complicated!
According to that article it seems as though the order of names from most prestigious to least is: Super Record, Record, Chorus, Potenza, Centaur and Veloce. Not sure where Mirage fits in to that list, but it is no longer listed on Campagnolo's website (nor are Potenza or Veloce to be fair) so I'm guessing it's been withdrawn since that was written.