That's an epic tough question. I liked both but for different reasons. The sotry and acting in the original was great. Because technology was still pretty low (in comparison) they had to rely more on plot and characters. The visual effects...... were so bad lol. So in the original show, EVERY dogfight was the same scene, I'm not joking. Here is some footage and it was re-used in almost every episode,
The Hand of God, 1978 Battlestar Galatica.
The new show had a great story up until the end, it felt rushed and (Crap we were gonna do more but the show has gotta close so just make up an ending). The visual effects, bro, ABSOLUTE amaze ballz. I got chills when Galactica jumped into the atmosphere, dumped her fighters, then jumped out.
So yeah I loved both and both had good and bad points