I see it this way.
- SkyEcho makes it easier for ATC to see me
- PilotAware makes it easier for me to see other aircraft.
So, the fundamental question is which is most important to me? Making it possible to prosecute me should I ever infringe, or making it possible for me to see other traffic and avoid a collision.
Of course, in a perfect world, I can see everybody else, they can see me, and I don't infringe. In which case PAW, separate ADSB-out, and traffic feed to something like eVFR or Skydemon is the perfect solution - pretty much as Cole Burner is doing, except that he's just using the SE2 as his ADSB-out.
(And actually yes, I mostly fly aeroplanes with ADSB-out AND PAW).
G