What's the best programmer for a 2008 ford super duty f-350 diesel 6.4L engine?

What's the best programmer for a 2008 ford super duty f-350 diesel 6.4L engine?

I would use nothing but Gail Banks Turbos. He does all research and testing in house. His programs will not hurt your diesel. Some others will.

The one that came installed on the truck from the factory.