I like all the lines you've mentioned.
The SGS scandi heads turn over slightly more smoothly than the Airflo compact scandis, but also don't turn over bigger flies quite as effortlessly, in a classic physics sort of way. Both of their forward tapers are longer than the PTs', without compromise in either power or distance.
What sets the SGS apart is that you can tell Bob/Steve exactly what rod you're using, what sort of application you plan for it, and they'll create a line that exactly matches both your rod's power profile and your casting style. That's really unique!