I'd rather have a smoother ride with no complication of stalling, so I went with Automatic. You also get better gas mileage with Automatic. I hate the feeling of being jerked when shifting gears. The Automatic is just so much smoother. This car to me is really for crusing around and blasting your sound system with the windows time and making people's heads turn.
If it comes to racing on a track, I am happy with what I got and I think with 420 HP I should be ok with having automatic. It is really personal preference. Both ways feels like you are driving a car, and with this car no matter which way, it is still an intense ride.