I don't think there is one best answer. Is it primarily used to tow or primarily used for something else. Are you looking new or used because budget to do the job can be anything. Is it going to make lots of miles a year or just be a secondary and TV.
If you are looking for a new light duty truck I say test drive the F-150 3.5 EB, Chevy 1500
6.2 8 speed, Ram 1500
Ecodiesel & or Hemi 8 speed, and the Tundra with 5.7. Get the tow package. Not a fan of the lesser motors but in your case with the light trailer even the smaller motors should be reliable. Often the smaller motor towing uses about as much fuel as their best motor. Unless price difference is stupid and turns your gut get the one you like the most.