jtsandbird,
You're asking about two totally different type of products. For dealer "stealth" you have to go with the EZ, if you un plug it there are no codes or anything that can PROVE you did something, with any brand of Programmer you can have dealers that are really gooooood that can be able to detect that you had a programmer installed at one time or another. Plus the Power Pup or Triple Dog is a much higher powered product as compared to the EZ, so that isn;t a fair comparision etc. You also have the van aaken plug in modules that you can get that are as undectable as the EZ, they have a mild and warmer HP box for the 2003+ trucks.
Mark @ DPPI