For my best drones, I use on these microSD cards and they are recommended by DJI for the Mavic 3 Pro:
https://support.dji.com/help/content?customId=en-us03400007643&spaceId=34&re=US&lang=en
Samsung PRO Plus 256GB V30 A2 microSDXC
Samsung PRO...
You need a card with a minimum U3 or V30 rating. The size is dependent on how much content you are generating. Memory cards wear out, there is a maximum number of times they can be written to. The sweet spot for me is 128 GB, and I'll swap them...