NS goes ape shit for FKS. they're harder to find because everyone loves them.
I have griffons on my armada alpha 2s, but I have ridden the FKS on a few different skis, and honestly you can't go wrong with either.
Marker Griffons
-Basically the lightest binding on the market.
-Plenty of hold, good DIN range for light and heavier skiers
-Wont rip out, no durability issues. I have had mine for 4 seasons they're fine if you don't trash your gear. personally i take care of mine.
-adjustable
FKS
-Also a very light binding, metal makes it heavier than the markers, but not really that noticeable. the density is what you notice
-turntable release is unquestionably a better system than marker, but as long as you're not pre-releasing I wouldn't worry about it too much except rails/buttering.
-Smaller contact point and drill pattern. the 140s have an excellent pattern for motion transfer. both pieces are smaller so you actually get a tad more flex and length feeling from your skis (not necessarily control compared to markers since they contact more ski). this is noticeable and welcomed, but the downside is there's more force on a few screws so you do run the chance of weakening the sockets over time.
-Durability is very good, many FKS last for years and years. however, if anything does brake, it can be difficult to replace
-not adjustable, so if you're growing or changing boots, this could be an issue
hope this helps!
that retention/release talk I would love to hear more about