I have driven both and like both. I think Stillen has quite an aftermarket for the Q45, and it becomes [with those mods] a car that will lunch on most Audi's. I have driven a '91 with suspension mods / chip; awesome open road car. Much quicker than my '89 tq was at the time [or is now, probably]. Stock, the handling was not that great [course, neither was my q].