I find the theme songs mirror the way I'd characterize the shows.
TOS - a little cheesy
TNG - proud and optimistic
DS9 - long-winded; revamped half-way through to appeal to a bigger audience
VOY - lots of nothing really
ENT - old stuff, re-packaged and sold as innovative and new
So I chose TNG, because the theme song is tied to many fond memories of me discovering Trek via great episodes.
No power in the 'verse can stop me.
"You know this roleplaying thing is awfully silly, let's just roll the dice." - overheard during a D&D 3E game.