I haven't used a hand mic for over a quarter century. A shielded pair is all I ever use for headset or mic, with shield grounded only at the radio, and all jacks insulated.
My friends love Trig and Becker, but I have a tough time with them. I am using the GTR-200 exclusively now. Its internal intercom is better than any stand alone I have used, and after the first three installations I left off the intercom ptt buttons.
In the Cubs with door open or closed we use voice activated with almost any good headset. In the Stearman we find that a matched pair of DC 10-13 headsets (either 4, S, or X) with foam and leather mic muffs, works great, even at full power.
Sure, when you hang your head out the window you get wind noise - but the Garmin recognizes wind noise, and partially mutes it.
Only drawback to the Garmin is a limited RF squelch circuit. Highly susceptible to RF noise, even at max setting. We live with it, even though it would be an easy fix for Garmin - they obviously know how . . .