In my track day experience, I have seen the following brands do well (in no particular order):
- Superformance
- Backdraft
- FFR
- ERA
- Everett Morrison
- JBL
- Unique Motors
- Hurricane Motors
Other brands likely have as much track potential, but I haven't seen them.
The biggest differences in performance were due to driver skill, tires and preparation. On a short, slower track where aerodynamics didn't matter much, I easily chased down and passed a C6 Corvette Z06 in the hands of an inexperienced driver. On a large, high speed track I was easily passed by a Porsche in the hands of a very experienced driver. You can always find someone faster than you and someone slower.
My bottom line is that a really good driver in an old style analog car like a Cobra replica can be as fast as an average driver in a modern car full of computer assistance. But if you put the same driver in a Cobra and a Ferrari 458, he'll likely be faster in the Ferrari.