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Assuming you have a late '99 and newer SuperDuty, I'd say you have a choice. If yours is older, like mine, the Delta is the only choice at the current time, but it has it's advantages too, for now. You can program in more power with the Delta, but that will come along quickly enough with the Predator. I don't know if the actual structure of the chip will change, or if they'll merely come out with programs that are downloadable to a burner, but if I were in the market, I'd wait just a little while, and get the Predator after hotter burns are available.
The chip will always have advantages over the tuner and visa versa. Switch on the fly is a big deal for multi-use trucks verses the guy who ocassionally tows.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.