I have a QFR, and the lightness really does bother me. I can't speak on the ducky zero, but it terms of build quality, if my ducky 9008g2 pro is like the major leagues, then i don't think the QFR would really even be in the minors. It's probably high school level, lol. But again, that's not the zero line. If the zero is anywhere close to the quality of my ducky, then it's an easy choice.
Also, font.
Also, the ducky zero comes with a neat sticker.