I never watched Babylon 5, Black Lagoon nor Vikings nor I plan to.
But DS9 was IMO the best ST series.
It depends on what people look for in it. DS9 is the series with the most pew pewing for sure, but I liked The Next Generation much better. In fact I would say my order of preference is:
1- The Next Generation
2- tie: Voyager and The Original Series
4- Deep Space 9
5- Enterprise