Amazon.com: RG CFExpress Type B 256GB Card (1700/1100 R/W) +SD Card UHS-II 256GB SDXC Memory Card U3 V60 (R 265mb/s 120mb/s Write) (Not Recommended for Nikon Cameras) : Everything Else
Nikon D5500 SD Card Comparison Write Speed and Fastest Memory Card Tests for D5500 Digital Camera - Camera Memory Speed Comparison & Performance tests for SD and CF cards