i've driven the Porsche Cayman, Carerra, and Turbo
the Turbo, although a monster in it's own right - is not a 'pure' track
car...it's more of a supercar for the street/daily driver
the Cayman, pound for pound, is the best track car out of the three.
it's superior in handling the curves.
the Carrera, well it fits in the middle.