there is no point in comparing. if you like a racy sport car, can do without certain amenities (like parking sensors and rear view cam), crave the NA sound at high revs, then it is the GT3 all the way. on the other hand, if you want an ultrafast and highly accomplished GT car with a luxurious touch, don't care about the looks, high revs and great soundtrack, then the turbo S is for you. unless of course you want to throw the supercar money which porsche asks for the turbo S at a real supercar and not at a squashed beetle in gen xxxxxx evolution.  peter