If ALL you care about is speed, then the auto is probably the way to go. However, my penis will not allow me to drive a boring-ass auto. I don't care how fast it is. The fun that comes with a manual trumps the 2 tenths of a second the auto might give (unless you just REALLY suck at shifting.) That's why my MGW is my favorite mod on my car, even over the cams and 4.10's. If I had my way, none of you would be driving autos....because they wouldn't exist lol. To each his own though, I just think autos take a TON of fun out of performance cars.
I applaud Ford. "We only offer our SVT Mustangs as MANuals. Get it? MAN-uals!" (paraphrasing)
I'm guessing you've never driven a car with a dual-clutch automatic transmission.