PS engineering fan !
I have one aircraft with the Garmin GMA340 audio panel it has been faultless with good audio quality.
I also have owned a number of PS Engineering products over the years, these have also been faultless ( the PM1000 is still going strong after twenty years ).
On the whole the PS engineering products have a better quality of audio especially when it comes to the performance of the squelch.
Both the Garmin and PS engineering products will not disappoint you, but only the PS engineering products will delight you.
Chickenhouse you are in the happy position were you can't make a bad decision with either of these products, but in my opinion the PS product is better maybe this is why all the upmarket headset manufacturers use PS engineering audio panels to demonstrate their products.