Voyager. The visuals are pretty and the theme tune's catchy, in fact, the title sequence is probably the best bit of quite a few episodes! Both the TOS and TNG openings are quite stirring and I love the TNG music. DS9's opening was initially a bit slow and stately for me, although it got better when they re-did it in Season 4. I still find the Voyager music more memorable, though. The Enterprise title sequence looks amazing, but the way it only shows American achievements is annoying and then there's that song... I actually quite like the idea of using a pop/rock type song, and I can see why they chose Where My Heart Will Take Me, but it's not very good, is it? Too middle of the road and cheesy, like that dodgy guitar music in the Babylon 5 pilot!