To be fair I haven't tried this specific event yet, I'm way behind on seasonals.
Related: K-cars. Drove all the premium ones for the K-car seasonal. Some interesting differences.
Cappuccino: meh. Not a fan.
AZ-1: tons of fun. Likes to slide. This and the Cappy have peak torque at low revs and peak power at high.
Copen: Great engine. Peak power nearly through the entire rev range, and low down torque. Turbos add crazy power (60->120 HP for the cheapest one). Drove the whole race in 5th just for fun.
Cervo: WTF gearbox. 1st, 2nd, 3rd, 4th, 5th, 6th taken care of by 60 MPH. Then shift into 7th and the thing bogs down like you hit quicksand. Made the go-kart track feel like a full-size one.