I don’t know anything about the qt horse but, I like my TWEECER. I would also suggest that you buy Binary Editor & EEC Analyzer. The tuning software that comes with the TWEECER is ok but, BE & EA are much more user friendly and updated often. I think that Clint (the designer of BE & EA) provides awesome support with tech stuff. Because I’m not much of a computer guy, he has helped me remotely when I had issues. Like I said, I’m not a pro tuner but, I can change anything in the tune that I want, ignition timing, injector size & timing, MAF, Rev limit, speed limit, just to name a few. There is a patch code for the A9P/A9L EEC that will allow you to adjust timing based on engine load also. That’s a really cool function for boosted application. You can retard timing as load increases to avoid detonation. Just as an example of how much I like BE & EA. I’m going to buy it again for the 3rd time. My 1st laptop died. My 2nd was stolen during a break in while I was at work.