TOS, who wants a captain that "plays" a detective in a holodeck when he's bored, Kirk banged crew-members or alien babes when he got bored...
I would have picked the original series if they had a few more seasons, another knock I had was some episodes are very dated like the hippie singers. oh, and the awful klingon make up, it's all a little too low budge but kirk, spock, mccoy and scotty are the best ensemble by far.
I've been re-watching DS9 on netflix from time to time and can only think "what kind of crap is this". Voyager was 10x the series DS9 was (after they gave Janeway balls in season2).
I could never really get into TOS, probably because I have a hard time getting into any older television shows from that time period.
For me: TNG, Voy, TOS, DS9, Ent
TNG
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In order for me: Next Generation, Voyager and Original.
I find TNG clearly the most watchable now, though, at the time it was in first run, I really liked Voyager. It seems to not have held up well over time for me.
The Original is too campy for me now.
Though I tried, I never got into Deep Space Nine or Enterprise.
MotionMan