cjc2 wrote:
Neither. Instead of getting an XQD or a Compact Flash (which the D850 does not accept) get a CF Express card. CFE looks just like an XQD but it is much, much faster. You will appreciate this when uploading images, provided you have the correct hardware to do so. Best of luck.
Thaz what I did. A warning before you suffer sticker shock: my card and reader were $240 at BH. 128gb card and a very non versatile reader.