Well, I must admit that I've not done enough testing of the Alpha, Honda, and the BMW.
I find that I can drive my most aggressive races with total control in the Seat. I feel like I know that care backwards and forwards. I have now driven the Chevy for the past 3 weeks with extreme mixed success. I love the Chevy at places like Valencia and Brands Hatch but put me on a slower, tighter track and I have a real hard time controlling that car. I find that on some tracks I run way faster in the Chevy and very competitive with the leaders (in public servers) but on some tracks, i can't keep it together at all...... In the SEAT I am much more consistent.
I'm going to try out the Honda this weekend and see if It fits. I've driven the BMW and it's a real handful for me. I get a lot of oversteer when I'm getting back on the throttle coming out of a turn. That's just tough to constantly combat. I could probably work in this and correct it via setup help as well as being less brutish on the throttle...... maybe a project for later.