I decided to do a small benchmark to several microSD cards I've used on the Anafi using a regular Mac based tool (free) called BlackMagic Disk Speed Test. I used as a reference the microSD supplied with the Anafi

And here are the results:
SanDisk Industrial 16GB

SanDisk Extreme 128GB

Transcend 128GB

Samsung Evo 64GB

All tests were done with the same settings on each card, and run for the same amount of time. All cards are readable both on the Anafi and on the MacOS.
The latest microSD's are the Transcend for a little less than 20 euros at Amazon, and the Sandisk Extreme for 24 euros also at Amazon. The Samsung is one of the cards I used on GoPros and other devices and were quite more expensive at the time....

And here are the results:
SanDisk Industrial 16GB

SanDisk Extreme 128GB

Transcend 128GB

Samsung Evo 64GB

All tests were done with the same settings on each card, and run for the same amount of time. All cards are readable both on the Anafi and on the MacOS.
The latest microSD's are the Transcend for a little less than 20 euros at Amazon, and the Sandisk Extreme for 24 euros also at Amazon. The Samsung is one of the cards I used on GoPros and other devices and were quite more expensive at the time....