The cards that most drone pilots rave about are Sandisk Ultra (V30 U1,
A1) and SanDisk Extreme (V30 C10, U1,
A2) the
A2 designation refers to "application load time" - which has no bearing on our use case, but is significant in terms of random reads. We primarily care about high consecutive writes as recording at hi bitrates is where cheap cards fall down. The
M3 will write H264 at 200 Mbit per sec, and H265 at 140 - equal to about 240? somewhere around there.
I've had no issues with these, also use Lexar Professional and High Performance 633x cards as well as Samsung Evo select, Samsung Pro Endurance and PNY Elite-X Class cards.
I would note that DJI sells the Sandisk Extreme for use with its Prosumer drones.
I have never lost a single byte of data. The reviews that are on Amazon are from idiots who mistreat the cards, or don't eject them or pull them while in use.