D5 & D850For which camera? CFexpress cards appear to the new standard. Check out this thread. It would be worth checking to see if CFexpress is backward compatible with XQDs. Currently, Nikon Zs accept both XQDs and CFexpress.
That said, I use Sony, since Lexar quit making XQDs a few years ago. 128 is my preferred size. Shooting locally, I don't often get close to filling it, but on trips to Africa I can easily fill a card in a day!