Keep in mind that specs like that are often inaccurate or even change in later firmwares. It is pretty common to see devices able to use larger memory cards than the specs say.
Good point. I always see a few people mention they are using memory cards larger than what is noted in any of the DJI specs.
There are a lot of memory cards that'll work. Here are a few good brands to consider:
SanDisk Extreme 32GB
SanDisk Extreme 64GB
Samsung EVO 64GB
Samsung EVO Select 64GB
Samsung EVO Plus 64GB
See this guide for more details on choosing the best memory card for you.
For the 32-64 GB memory cards, the Extreme has a max write speed of 60 MB/s (or 90 MB/s for 128-256 GB memory cards) and the Extreme Plus has a max write speed of 100 MB/s.
The difference is in the 'maximum write speed' (Extreme plus is faster - and Pro is fastest). While this sounds relevent, it's acually not! That's because what you are looking for is the ability of the card to 'sustain' a certain write speed as a minumum under load. That speed has to be higher than what you need to write at, to stream HD video onto the card in real-time. That's why the most relevent specification for a card used in a MAvic 1 or 2 Pro - is the 'UHS Speed Class' symbol. UHS Speed Class 3 is identified with the logo having a U with a 3 in it. U3 cards will sustain a minumum write speed of 30 MBytes/sec (240 Mbits/sec).
Just for reference, the 'Application Performance Class 1' (A1) logo is telling you that the SD card is optimised for use as expansion-storage in something like a phone or tablet. A1 cards are good for this because they can handle the launch and operation of app's stored on them (when you run out of internal memory on your phone or tablet).
