Having owned both cars… My gti(2006) out performed my wrx(2008) every where.
But one thing I disagree on, the wrx is infact lighter than the gti.
But again, the variables are great here… The gti comes with performance summer tires and the wrx comes with the shittiest tires out there.
throw a set of good tires and some sways on the wrx and watch the out come then