GTR, all day, any day. That thing is a true beast, and really should be tracked at every chance possible.
And at $30K more than an M3, I'm not sure if they should even be compared to one another.
It would be like comparing a 128i to an M3 coupe. If you can afford the M3 (i.e. GTR) and understand it's a wild horse, just do it.
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