The real champion
I will offer no opinion, being a fan of both. But I think this might be an appropriate moment to share the last five minutes of what, in my opinion, was a better sci-fi franchise than either- and of possibly the best series finale ever.
Here are the last five minutes of "Sleeping in Light," the final episode of Babylon 5.
BTW, the guy pulling the circuit breaker and turning out the lights prior to the destruction of Babylon 5- its mission accomplished, and now a hazard to space navigation, the vessels of every spacefaring race in the galaxy to which it played such a crucial role in bringing peace gathered in final salute- is none other than "the Great Maker," J. Michael Straczynski, who is to Babylon 5 what Gene Roddenberry was to Star Trek and George Lucas is to Star Wars.