Why SCT? Because straight out of the box without any tweeking an 8000 CC long bed truck ran a 14.26 @ 93.07 mph on it's first pass! No intake, water injection, nitrous or any other mod except MBRP 4" exhaust w/o a cat. This is also with 34" tall tires. I haven't seen those kind of numbers from the other 6.0 tuners/programmers.
There are certainly better numbers than that out there, but for a max EGT of 1378, max boost of 28 psi and no climb in tranny temps, the SCT can't be beat. Try running an Edge or Bullydog on max for a 1/4 mile and keep the EGT under 1500! The SCT is also the bomb for heavy towing with it's boosted line pressure and firmer/quicker shifts. No other tuner can control the tranny like SCT.