So with all the variations of microSD cards out there (SDXC, SDHC, Class 10, UHS-I, UHS-III, A1, U1, U3) looking for recommendations. Will probably be getting a couple of 64gb's.
I only used the Micro Center ones because I work near one of their stores and each month send a coupon for a free 32G Micro SD card or SD card. They work just fine.
Personally, I try to stick with the U3. They have the fastest write times so they are fine all the way up to 4K recordings. And remember, the Spark may not give you 4K vids, but it has a very high quality camera that just crops down because of the 2-axis gimbal... so the faster the better... why skimp on the most important reason you have the drone in the first place!