The Italian bee or Apis mellifera ligustica in its scientific Latin name is actually the Latin bee. It originated at what was the heart of the Roman Empire in Italy. This bee has been farmed for thousands of years.
Italian bees are far more prone to drifting. If you place your bees in lines (as most people do in apiaries) you will find that you get drifting to certain hives that then become really strong.
Both Italian and Carniolan bees are generally excellent choices of bees and should give you great joy working them. If you cant make up your mind, just take the plunge and start with whatever you can get.