Real world experience...
I've owned 2 F150s HD with ecoboost and towed a 35' TT. They did the job much better than expected, both we very capable vehicles. I towed the Cougar 321-RES 30K miles though some of the worse conditions and never had a "White Knuckle" experience.
I've now upgraded to a new Reflection 313-RLT and the tongue weight jumped to 1600 lbs. So I stepped up to 2016 F250, 6.2 (same body style/trim level)... I'm not impressed at all, the F150 was a better truck all the way around (better ride, better fuel economy, better performance and better design).
Can't wait for the 2017 Super Duty to come out, since they are combining the beat of both vehicles. This time, it well be the desel.