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I'm sure all of you have seen the Edmunds "Inside Line" article which does a balanced comparison of the two engines with similar conditions as part of their standard evaluation. I think the 6.2L edges the 5.4L in the numbers but not to the degree you would assume based on the displacement difference between the two.

http://blogs.insideline.com/straightline/2010/06/il-track-tested-2010-ford-f-150-svt-raptor-62.html

At this moment in time the engines are very similar, but that said, the potential for generating additional horsepower goes to the 6.2L (if that is important to you).  The 6.2L is capable of 500 HP when tuned properly as the XT clearly proves.  To come close to those levels with a 5.4L you must turn to forced induction. So maybe what the 6.2L really offers over the 5.4L is what Nigel Tufnel of Spinal Tap eluded to when he described why he preferred his amplifier to others, "because these go to eleven."

That being said, in a prior interview with the lead SVT engineer and as eluded to in the Edmunds article astronomical levels of HP may lead to premature failure of the off-road components that truly make this truck so special.