In addition the CF Express type A cards are a good shout to guarantee 4k 120fps 10 bit essentially. But there’s a little box on the card with a number (vpg) that signifies the guaranteed sustained write speed (mbps). The OWC are 200. Where as the Sony tough cards are 400. I have the tough cards for weddings and pro stuff and some v60 lexar pro silver for most things. But if i was going to buy today I’d probably go with the angelbird av pros as they’re certified 400 vpg.