I voted for Deep Space Nine.
Mostly because of the great characters (not only the Main Characters, mostly all of the recurring gast stars as well) and the storyline, the sometimes "darker" feel (especially for Star Trek) and it was actually the first Star Trek series which tried something "epic" (ok, some of the early Borg-episodes in TNG could be descibed "epic" as well, but it was nothing compared to the stuff they did later - In TNG after one or two episodes, everything was fine again and the Enterprise moved on to the next planet of the week
) and at last, I liked DS9 a lot for the big space battles, lol. It was really fun to see all these Ships finally in some really big space fights.
Besides DS9, I really like TOS & TNG as well. I liked Voyager in the beginning, but later they did some really weird things here and there and they startet with stupid timetravel-episodes which maked not much sense. That trend was also set in Enterprise, and i never really liked the series until season 4. I enjoyed some of the epic stuff in season 3, but I thought the overall plot in season 3 was much to simple (nothing compared to DS9 or Babylon 5), so I never really cared for season 3. Season 4 was much better (finally) and they finally started to make "Star Trek" again which was the right decision. To bad it didn't helped the series. The last episode was crap, of course. Probably even "Spock's Brain" (TOS") or "The Fight" (Voy) were better than this bullshit.
I hope they get things right in the upcoming movie...
there is always hope
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