Funny that, I have the opposite experience. The only reasonably good stickerless 3×3×3s I have are a GuHong and a Valk3, and I'd say the DaYan shades are just slightly easier to distinguish under dim lighting. (GuHong is kind of old and I don't know if their newer cubes use anything different, but presumably they don't.)I find the QiYi shades aren't as bad as the Dayan stickerless, really used to struggle with those unless every light in the house was on.
They're also both much better than my stickered Aolong v2 (with the standard shades), which used to cause me grief every time I practised with it.