I thought the Hellenbach would be the best as it is the fastest, but it's durability sucks and the track needs a good durability. There aren't much vehicles with perfect durability and speed combination, but the cop car is just perfect.
Yea, I used a cop car the first time I played the game because I didn't know how fast the Hellenbanch GT was and I just threw it in the crusher in Harwood. But, your right about Hellenbanch GT's durability. It flipped the first time I used it.