I've made a little comparison of the load times between Zelda Breath of the Wild running from NAND, SD or Game cartridge.
Video:
This is the SD card I'm currently using: https://www.amazon.de/gp/product/B073JY5T7T/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1
Video:
This is the SD card I'm currently using: https://www.amazon.de/gp/product/B073JY5T7T/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1