Which SD card is recommended for EOS 6D Mark II?
Just a get a UHS-I SD card is OK. No need for UHS-II SD cards.
Saving this thread
Sandisk Extreme Pro UHS-I SD card.
This one: SanDisk Extreme PRO 128GB UHS-I U3 SDXC Memory Card https://www.bhphotovideo.com/c/search?Ntt=SanDisk+128GB+Extreme+UHS+I+Memory&BI=8941&KBID=10361&SID=12345&DFF=d50
To add to the point above, everyone is stuck on SanDisk but unfortunately i've had some annoying issues with their recent batches. Had two cards just die on me mid-shoot recently which really sucks when you're doing a DIY project or a paid gig. Basically the thread is right that you only need UHS-I for the 6D Mark II. No point spending extra for UHS-II pins the camera cant even see. But i'd look at these alternatives if you want better reliability:
Any UHS-I V30 cards are OK.