I can offer up a PIREP from the g3x autopilot and my thinking. I currently have it in my glasair and it will be going in my -10 if nothing changes over the next few years of riveting. An opening caveat, I've not flown behind either of your other choices.
Performance has been flawless in an airplane that is not forgiving to autopilots, and integration is great. I still haven't had it do anything to surprise me, and it does a great job of flying the plane in all modes. I don't have the separate control panel (305), and I don't miss it though airspeed hold would be nice to have.
There is a school of thought that the autopilot should be fully independent as a backup way of keeping green down and blue up if all else fails and the window only shows white. In my mind a fully integrated system is less likely to surprise me than one working through an interface. Pick your poison.