I am Ford man like my Dad. My dream car has always been The Shelby Mustang. The new V6 Mustang puts out impressive specs, but it is still not a V-8 Shelby.
At the end of the day, I cannot afford two cars. The Mustang IMO would be a bit useless come winter.
So, if I had to choose between the two. I went with the WRX, you can pick apart it's quirks. But every car has their own, one way or the other.
I feel with the WRX, you get the AWD traction. And still a lot of fun to drive, with still impressive specs.