If for track use, the GTR wins, definitely. The GTR is a 911 Turbo killer, so the M3, even the E92 M3, is not a competitor.
For daily use, I wouldn't know. I have a feeling the GTR is quite easy to live with, but if reliability is an issue, in the long run, the M3 should have a slight advantage bcoz it is naturally aspirated. For Malaysian roads, I would go for the GTR bcoz it has 4WD, therefore easier to tame in slippery conditions.
In the final analysis, there is very little to choose between the two. It is a matter of personal tastes and inclination. My believe is anyone who bought anyone of these 2 machines will in the be an avid fan of the car. Both are excellent cars with it's own character. Massive egos are massaged everyday by driving these cars.