That really depends on how you shoot, I guess.
Do you encounter any buffer issues with using only the SD card?
Also, you're not able to do backup or RAW/JPEG shooting with only one card.
As mentioned in another thread, I can't comment on buffer speed issues when only using the SD card.
I have mine set up to RAW -> XQD and JPEG -> SD.
I’m mainly a sports photographer so buffer speed is SUPER important. I don’t do the backup but definitely would if I had both that way I would finally be able to use the snapbridge app. Do you think your xqd is better overall?