I've owned a WRX and GTR so I can shed some light.
Simple truth is, the WRX is so forgiving, it makes all drivers look good. Sure a gtst has better torque, thus better acceleration in a rolling start, but from standing the WRX wins cause of the 4wd advantage.
Your 32 Gtst will have a more better chassis as it's similar to the GTR's chassis. Skylines have a more solid feel to them and give you more confidence cornering. WRX brakes are OK. GTSt, depends on which model you have but the 4 piston calipers will have the upper hand.
Grip, WRX hands down. Again the 4WD. No drifting though. Naturally more cornering speed in a WRX, but don't go thinking your invincible in the wet.
Comparing a WRX to a GTR, depends on what your priorities are. Money wise, WRX. Performance wise, GTR everytime. Better chassis, better brakes, more power, more torque. GTR will leave you with dry teeth from grinning too much. Only drawback is you have to learn how to use ATESSA to get the most out of it.