While I will always be a fan of Star Trek in general, I will always enjoy watching Deep Space Nine. I feel that it is THE BEST serious out of the 5. Given that is has a continuous storyline through most of the series, it also has much more deep character development and attachment. While TNG has complex characters, the storyline is not something that is very continuous. Deep Space Nine is something I would recommend to any sci-fi lover. The comments and issues brought up about human nature, society, and everything in our world will teach lessons that will be relavant for years to come. Not to mention the special effects done from about special 4 to the end. The Dominion war is something that most Star Treks do not venture into making it more exciting in that regard.