the weight of these two cars are pretty close.
if its on a track with lots of turn, id say the skyline definately wins. the skyline is quicker than the 350z track, and the 350z is comparable to the e46 m3. in a straight line, i think they re pretty close, but the skyline can easily gain more power. as a daily driver, i think it would be pretty close, the m3 being a little better.