I've only ever seen, and am a huge fan of, the re-imagined version. I never saw the original series.

The new BSG is absolutely phenomenal, in every way possible. The casting, the performances, the special effects, the music, the story, everything. It is, in my opinion, the very definition of high quality storytelling and is definitely among my top five favorite shows of all time. Hands down, no contest. I mean, I am biased because I love it so much, but y'know, there is a reason why it was so successful. I highly recommend it whenever you get the chance to sit down and watch it (from the miniseries to all four seasons, plus the two telemovies and the two prequels, Caprica and Blood & Chrome).