B5 is a more honest tale (feels handmade and passionate), that you might not appreciate if you need high production values to keep interested.

B5 is less accessible, and sometimes you need to be paying attention. DS9 is better at spoon feeding you and making sure you have what you need. B5 is trying to tell the B5 story. DS9 is trying to expand its region of Star Trek story telling, and occasionally wanders into expert episodes of single story high sci-fi. B5 is a different kind of epic (more like a Space Opera)

They both do great things but some people want the backing and polish of a Star Trek univese, which can make DS9 feel more like home, whilst also preventing it from feeling alien. B5 feels more alien and like there's something unknown going on, as scifi maybe should?