http://www.youtube.com/watch?v=BPVGHeCzBfg
Here is a clip I found of some older Ferrari's and Lambos's with great sounds! If I had to choose, I think I'm more of a Lambo person overall. Lambos are more for an attention hound and Ferraris are slightly more understand, but still cocky enough. I think that each other the cars in their line-up has some definite strengths and relative weaknesses.
Lambo Gallardo LP540: an exotic that can be used in almost everyday driving, great v10 sound, and Audi technology
Lambo Murci LP640: one of the meanest looking cars on the road, intimidating sound, scissor doors, but difficult as a daily driver and some dependability issues
Ferrari F430: an enhanced version of the classic 360 Modena combined with some Enzo touches makes this exotic the best looking and cheapest Ferrari model
Ferrari 599GTB: expensive, but probably the best sports car/GT car ever made when combining speed, comfort, and exclusivity
Ferrari 612: I'm sorry...this car is boring! The price is ridiculous for what you get, a backseat?...who cares!