I think B5 generally had the better story. DS9 had much better production values. Not to say DS9 didn’t have some great stories, but B5’s was just better thought through and more cohesive. The story arc was clearly planned from the beginning with B5 with all the details that get seeded in early seasons and pay off in later seasons. DS9 is much more episodic (except for the whole Dominion war thing) with not nearly as much development.