Manual all the way!
From the humble beginnings of my underpowered Jetta, up to anything else, the only exeption of things I drove that haven't had the gearlever, was a really HP happy Mercedes I had to drive for a night (600HP. O.O).
and once I talked to an engineer, why all those upper class limos barely have manual anymore, he just told me: you know from your first driving days, that false gearshifting, made the car a bit wobbly and shaky, down to engine failure.
if you do that with about 500 or more HP, it may easily happen, that the engine doesn't care, but the gearbox just gives in and crumbles under your car in a nice straight line to broom up. Or break the transmission axels if we're talking about tuned up cars.
Final thing: theres reason for Automatic, but it is just way out of use for me. Gimme manual and I'll be happy.
And yes: Prolly even on trucks with 16 gears (once I would be allowed to drive those).