After investigating extensive user reports, we found the top 5 best micro SD cards for 4K videos. SanDisk Extreme 256GB micro SDXC U3 card Samsung EVO Select 265GB micro SDXC memory card Kingston Digital Canvas React 265GB micro SDXC PNY Elite X128GB micro SDXC Class 10 U3 card Lexar Professional 1000x micro SDXC UHS-1 card