Welcome. If you want the power to pull, get the ecoboost. The 5.0 will do fine but the ecoboost outshines it when it comes to pulling.
Both motors have "issues". 5.0's have knocking issues, ecoboosts have fuel in oil and shuddering issues.
The fuel in oil is common to all direct injection motors. The shuddering can be caused by wrong plug gap or water in the intercooler.
2012 F150 Super Crew Lariat W/Ecoboost
Truxedo LoPro Tonneau Cover
Stage3 5* 91oct Performance Tune
First Ford I've Ever Owned