I'm naturally confused as to which programmer is "best" as there seems to be plenty of differing opinions on here. Seems many, if not most recommend custom tunes over programmers or chips. What I really would like is something with a tune I can optimize for towing and another for fuel economy and then one for pure performance. I like the idea of being able to customize and tweak a bit, but really want something I can switch fairly quick and easy whenever my A.D.D. gets the better of me. Suggestions please?