I have 2 micro SD Card 1st 8 gb class 4 which is not good for you if you record a video because it lags a lot class 4 Micro SD Card is good for playing music and watching recorded videos.
But SanDisk Class 10 is good but not the best. its good for small gaming if you install all your games in SD Card. If you want to buy high class SD Card for recording videos in 4k in your phone then go for Sand Disk UHS Series. if you have a good phone and don’t have a good SD Card then its not good for you. so go for Sandisk Extreme 32 GB MicroSDHC Class 10 90 MB/s Memory Card.