Which is the better car 2015 Subaru wrx or 2015 ford Mustang 5.0?

OK so I drive a 2006 ford Mustang gt. I've had my car for about 2 years and it's been a good somewhat reliable car. But I feel like it's time for an upgrade I currently work for Subaru and since I get a discount would like to get a wrx. But I like a wrx and mustang it's a tough decision on what to get. Can someone give me major differences between the 2015/16 wrx vs the 2015 gt 5.0. It's going to be my new daily driver. Probably only take it out to the drag strip once. Also if I do get a wrx what are websites I can find aftermarket parts for it.

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