I've owned both and the auto is spectacular but different. The manual required, in my view, immediate mods to deal with its wheelhop and shifting issues. The auto is just coordinated, repeatable fast right out of the box. Three shifting modes, take your choice. You are not really giving up any power you can detect going auto. I've shot out low-mid 4s 0-60 using an idle launch, on a cold road and oem tires with the auto and I can do that pretty much 10 out of 10 times. Manual shifting the auto makes curvy road driving competent as well.
Ford had to have a do-over on building my manual trans after less than 15K. It just started whining loudly. I had no further issues after they rebuilt it but, hmmm.....
As has been said, try both and see what you like. They are remarkably different, for the same car.