both are right around the same price range ... my reasoning is i live in ct ... the wintry weather can get alittle dicey ... so im looking into an AWD car ... and these are the 2 ive driven and liked the most ... so if anyone has personal expierience likes/dislikes etc ...
I've drove the G35 for well over a total of 30 hours probably and I absolutely love that car. Every detail of it is just perfect to me. I haven't drove an A4 so I won't comment but I will say the G35 is my favorite car I have ever driven to date.
I drove an a4 for well over a year and drive an 06 a4 2.0T on a pretty regular basis. I am a big fan of audis, but with that being said i would not recommend the 1.8 or 2.0t. The turbo is extremely jerky, it is hard to accelerate at a constant pace and i dont care to much for the sound of it. I owned the 2.8 and loved it, very smooth at all rpms and sounded great, not to mention the quattro was awesome in the snow
Im leaning towards the g35x, from a few different standpoints, being repairs, to interior comfort, to engine, im not necessarily looking for the most high performance vehicle but i do know the cars are quite fast stock from what I've experienced