I havent seen a whole lot of the HPtuners, but the first thing I noticed is it looks WAY COOLER than the PT.And looks a little overcomplicated to change settings(injectors/gearing/ect)
Now I have a PT, and THEY ARE CHEAPER hands down, you also get acces to a forum, and access to reprog any 3800 motor, were-as the HPT has 2optional years.
The pt is more user friendly and aimed for more of what you as a 3800 tuner would look for.
Bottom line, price,what you get, and ease of use-THE PT hands down.
If HPT had the same price, and open source programming, I would prolly have gotten HPT, just because it looks cooler. But I like having access to the "closed" forum, because I dont look like a moron for asking a question, and most guys there have been there. Also HPT you have to purchase updates, PT=free lifetime updates
Remember the fact that HPT was based on V8 programming, so its aimed and labeled towards them. The PT was designed by a 3800 enthusiast(Charles Beyer/DHP), so its more aimed at you and what you would call a certain feature/setting.
-I dont think I went overboard-did I? Either way you, you will be able to whatever you need to do.