I have a loaded 17 XLT (202a luxury package) and love it. The ecoboost motor is no more complex than the 3v 5.4 Triton. Same concept, long timing chains, vct solenoids, etc. Power wise, the 5.4 CANNOT touch the ecoboost. I've owned 2 of the 3v 5.4 trucks and they were solid runners. Throw a trailer behind them and you'll wish you had turbos. Buy an ecoboost with low miles and certified pre owned or add Ford warranty for power train if you are worried. It covers turbos, water pump, timing chains, differentials, etc. I recently had to replace my instrument cluster, which cost around $400 but I have yet to read of a similar issue in any other 15-17 trucks so my luck I guess. Other repairs seem common across the platform regardless of motor.
Sync 3 is fantastic as well, and did I mention that 400hp monster under the hood (achievable with just a mild tune and premium fuel)? Also if you do any mountain driving or live at altitude, the turbo motor is not affected and just purrs along at low rpm even with a trailer and steep hills. I get the v8 argument being made here, but I doubt it is being made by any ecoboost owners, so my opinions is just for some perspective.