Advanced flight systems
I had dual AFS 3400s in my RV7A in the past, and am putting an AFS 5600 and power control module in my adopted RV8A that had a mix of GRT and Dynon screens. I considered a full Dynon EFIS/Com/ADS-B system this time around but went with the AFS EFIS.
Why? First and foremost, I had flawless performance of the 3400 screens for 550 hours over 5 years of flight, and totally top-notch service -- quick and comprehensive phone help during install and setup, as well as a few questions later. Even by the very high standards of the competitive experimental avionics market, AFS people stand out as the best I have dealt with and I appreciate that a lot. Dynon cannot even return an email on a pitot/static tube after 2 weeks with emailed reminders. Not a good sign.
That said, as to the hardware: 1/ the AFS display size/aspect ratio is better (the 10" AFS is taller (more screen area) than the 10" Dynon) and I prefer the color/discrimination used by AFS (you really need to see them side by side in person or from your computer, 2/ the pilot interface/buttonology is quicker for me to use (matter of personal taste, I know), and 3/ button and touchscreen setup eliminates some separate control panels and back panel boxes. Simpler is more reliable for the amateur installer.
There is plenty of good choices, but after the research I went with AFS. Garmin? Good hardware -- I have one for hiking and one for driving. But in the aviation market, Garmin pricing, product development, and repair service business model doesn't have the experimental aviation focus of AFS or Dynon.