Advantages are that it's 1-piece, they are available in the JY, possibly from a lower-mileage vehicle and needing little repair. Another advantage is decent-sized disc brakes.
If my research is correct (Rock Auto), the 2003-2010 Vic has 12.01" rotors, while the 1998-2002 has 12.42" discs. Brakes got smaller as the cars got newer.
The 2003+ Vic copcars have the very flat-looking wheels, and possibly there was a wider track integrated into the design. There may be other changes in the overall brake system to compensate for the now-smaller rotors, or the vehicle may have gotten lighter and not needed as much braking.
As always, don't just take my word for it. Take my word and then dig deeper to verify for yourself.