I can’t give you head to head on that as I only tried a Decklink for about a month and never had both products here at the same time. Basically the two products are almost identical in feature set.
I went with the Kona 2 and have had it running almost daily since December. Rock solid, incredible tech support and I prefer the K-Box with all external connectors over the on-board SDI connectors. Easier to connect, disconnect various decks from a rack mounted box than going behind the G5.
Tech Support is just outstanding with AJA and they have a very tight relationship with the FCP team so they’re always on top of OS and FCP updates.
I guess you’ll just have to look at reviews for each individual product and see if any feature jumps out at you as a “must have” from one or the other.
Walter Biscardi, Jr.
Creative Genius, Biscardi Creative Media
https://www.biscardicreative.com
Now in Production, “The Rough Cut,” https://www.theroughcutmovie.com
“I reject your reality and substitute my own!” – Adam Savage, Mythbusters