Have always used PCL fittings until recently, when I swapped to the Euro type, mainly because I got some tools with the Euro connectors already fitted. One major difference I noticed is that the Euro ones have a larger bore than the standard PCL which may or may not be important to you.
A good idea which someone mentioned on another thread recently is to use one type for tools connected to an oiler and the other for clean dry air. I got my Euro fittings from Amazon – see here