I think there's room for multiple roadsters in this range, and for consumers, competition is never a bad thing. So having GM and Mazda constantly trying to outdo each other should (hopefully) only provide better products for drivers down the line. Hopefully, it will even get us a Mazdaspeed NC too!(first)
Pretty much as it stands now, it's a virtual toss-up. Yes, I'm sure people will link to a few sites/people that preferred the Solstice or said it had better features/times, but someone could also just as easily point to several other very reputable publications that feel and report otherwise.
I had the oppurtunity to test drive the Solstice before buying the Miata. In fact, I had originally intended on getting one. It's a fine car.
Should be fun times ahead and Roadster lovers