They both have there place. But you can not compare the two. The only vette that could scare Farrari is the zr1. But iam sure that still dosn't scare them. Like the 599 the f12 is a gt car. It is ment for long easy drives. It is not ment for the track. The same gos for the vette. Now you can campare the zr1 to the 458 italia. Both cars were made for the track. The Farrari is about 100k more. But they are closer in hp and weight.
If I never had to worry about money again. There would be no vette in my name. I know I would have a Porsche gt3 rs, Zonda r, BMW M3, a well tuned mustang, tuned wrx, a tuned 370z, And a 458 italia. And a few others.