DS9 is the best series, Sisko is the best captain
I think ds9 as a show has the most compelling storyline, with the serialized nature contrasting with the relatively episodic tng, voyager, og, and enterprise. I think Sisko is the most unique, compelling, flawed, and interesting captain in trek. Imo the political atmosphere of ds9 is the most interesting too, with the way the factions all vacillate between ally and enemy at different points in the story, showing a very true, intriguing side of the wartime federation.