I think if I were buying an F150 without question I would get the EcoBoost. There is no comparison between a normally exasperated engine and a forced induction.
I believe some one posted that the 3.5 EcoBoost, was at least the equivalent of a 7.0L NA engine, likely even more as you go to higher altitudes.
The biggest question with the EcoBoost when it was first introduced was longevity, I have not heard any thing of EcoBoost all dropping dead at 150,000 miles, and I am sure there are many out there now with that many miles.
I would love to see the B10 and B50 numbers on the EcoBoost, they may surprise the naysayers, (myself to a degree on longevity).