The products you speak about are essentially different so opinions and reports of the Oz system versus the Irish system do stand a balanced comparison
The EUROCAT-E product was intended for use within Europe, (e.g. Ireland, Croatia, etc) in areas with high traffic density and significant radar coverage. It was designed to a Eurocontrol specification by engineers. It’s complicated.
The EUROCAT-X product, (e.g Australia, South Africa, etc.) was intended for use in areas with or without radar coverage. The principal control functions are based upon the use of Flight Plan data associated to radar and/or ADS/CPDLC data. It was designed with ATC operational input. It’s intuitive and flexible.