Did you testdrive them both? IMHO, you're asking this on a Euro forum so most people here will give you a biased answer.
If you go with the G37, make sure you get the G37xS.
Don't get the TL, the exterior is hideous IMO.
on the audi i guess your risk is relatively small.. still under warranty for the next year or two. Drive it for a year and sell for 25, not a bad deal.
As a former G owner, the G's exhaust is intoxicating stock
I know. Aftermarket sounds even better. SICK!!
Why dick around with that, get the big brother gallardo.