What I liked about the B5 series was mostly the fact that it had Maciavellian politics and space battles where the fighters didn't fly like aircraft even though they were located in deep space.
Star Trek movies have always been about space battles and ridiculous action, even though people like to blame JJ Abrams for that one. That said, there are quite a few Star Trek episodes that do a good job of dealing with a social issue and/or politics in an interesting way.
I went off the Star Wars series after the "Battle of the Teddy Bears" in Return of the Jedi although I rather like the animated "Clone Wars" series.
For really good Star Wars, you have to go to the books. The same expanded universe that Disney announced is no longer cannon so they can "free up" their screenwriters or some other bullshit. Well, as far as I'm concerned, if I have to choose between the movies or the books to consider cannon in that universe, I'll pick the books every time.
The Star Trek shows I watched the most of was Deep Space 9 and Voyager which I rather enjoyed and which is probably even more heretical than saying B5 is better than ST.
I've emphasized Voyager there for you, because that IS heretical. I hereby authorize burning you alive at the town square.
I mean, c'mon. You just finished praising B5 for making an honest attempt of respecting physics and you finished by praising the show that brought to you polaric ions, nucleonic beams, metrion isotopes, psionic properties, and fluidic fucking space? Every problem in that show is solved with last minute bullshit technobabble. When TNG used technobabble, they had a science advisor on the show to fill in the words, so they'd have some connection, no matter how small and fleeting, to some real science. Voyager just made up works that sounded sciency and they used it as the Deus Ex Machina EVERY...SINGLE...EPISODE..