Hmm, well let's see here.
The original BG created a whole new universe to occupy, with new language (microns and yarns and felgercarb, oh my!) and mythos whereas the new version set itself up a bit more like our own perceived society and its technology, so the original scores a point for creativity and is more science-fictiony than its follower.
However one might argue that the new take makes for more familiar storytelling, metaphor and allegory, making it more compelling to watch for the non-fan. One might also argue that the new version took the easy way out in that respect.
One thing I'd like to bring up is the way both versions take on the basic premise of the story -- back when it first came out in 1978, we geeks had three science fiction shows on television to watch: Star Trek in reruns, Space: 1999 in syndication, and Battlestar Galactica (some got to watch Doctor Who as well). David Gerrold once took all three shows' premises to task in a Starlog magazine column he wrote at the time, which was that
Space:1999's premise was more "Wagon Train to the Stars" and ludicrous to boot - the moon, traveling fast enough to hit a different solar system every week; Star Trek's was one of hope and exploration; and Battlestar Galactica's was a simple premise of "Here come the bad guys! Let's RUN LIKE HELL!!!"
He didn't much like Galactica for that reason, and I'm inclined to agree with him.
Be that as it may, running away *is* the premise of this show, however the devil being in the details, I feel the newer version does a much better job explaining why that decision was made, and the reluctance and eventual determination of all the characters involved surrounding the events and conclusions of the story told.
In fact, I could criticize the new version for making ALL of its characters a bit too reluctant, with the exception of Starbuck: Adama is reluctant to flee, wishing to fight instead; Tigh is reluctant to fight, preferring the bottle and card games on a museum ship; Apollo is reluctant to be Adama's son; the President is a low-level bureaucrat forced to take charge; Baltar is the villain, and yet he denies it; et al.
What I find amusing about the hate for this show (not necessarily here) is that it's based on things that the story and execution isn't about: Some folks just can't look past that skanky blonde or the gender changes or the fact that Sci-Fi cancelled Farscape or that B&B have ruined Star Trek.
To be honest I could really dislike this show for casting off the truly interesting mythology the original created -- I would have preferred that it had gone that route and really turned things on their collective heads and been controversial as all hell, but it didn't and I still don't hate it for that.
I mean, it tells the same basic story in a different way, it certainly has some parts worthy of a groan (as did the original), the reason the Cylons hate humans has a bit more backbone now and makes a bit more sense, and in true television fashion gives a bit of fan service.
Big deal. It was enjoyable enough, and I can't believe I've spent this much time writing about it.