Welcome to the forum. Let me tell you, I have the screw with the 5.0, That was my choice, I like it But your best best bet is to do a search on both engine choices here, I'm sure you will find the info you are looking for. Everyone will have their own preference for certain. Good reading. Share pics when you get that new ride.
__________________ 2012 FX2 Screw, 5.0L, Red candy Metallic, FX Luxury pkg, convenience pkg, 20s, Tow pkg, . . NEW
2014 Ford Taurus, Ruby Red, loaded SEL, 3.5 V6.
I will add to the above. After you do all of the online research and your eyes pop out of your head, test drive both. Then make a list of what you want to do with the truck. I personally like the 5.0. There are thousands of the eco's and 5.0's out there with no problems. People come to forums to vent or share quirks with their trucks. No two are exactly the same. Put your research together with the list and mental notes from the test drives, then make your decision.
Oh, and welcome to the forum. Lol.
EDIT** Don't forget about the 2.7 Eco. It's the new baby to the Ford family. Might surprise you. Same with the 3.5 NA motor.