F.A.S.T. IMHO. And Multiport is much better. But of course it’s more expensive and there’s the intake mods, etc. But you can do some much with it (vastly superior in tuning details to begin with)
At the very least, I would strongly recommend finding a local tuner or someone/business that will help you with analyzing and emailing you tunes ... that would be best way regardless of which manufacturer. Unless your experienced with tuning. I’ve watched and read thread after thread on car forums with people struggling after popping TB ,self-learning units on.
Sorry - NOTE. I’m not even sure if the TB units you can even up and download tunes from laptop or through handheld and laptop. ... I would think so these days. But I know with FAST XFI 2.0 (multi port) you can. I can download the tune and log at the track (or garage at home lol ), email it to our tuner, and in 3 minutes I have an updated tune emailed back, downloaded and running. It’s a trip.
My wife has XFI sportsman on her street 57 Chevy and it’s heaven ... all in with intake work I think it was about 2800$
