The 2010 Z4? Cuts right to my heart with an incredible engine, drop-dead gorgeous looks and a drop top. The Nissan 370Z? Cuts right to the heart of my budget and has better power output, brakes and suspension. However, I'll leave it to Jezza to sort out the details between the two all-new coupes.
I'd also recommend you ignore the stupid dinosaur references, they don't make a lot of sense and I'm pretty sure you'll never get chased down in a Nissan by a 'raptor.