Both are adaptations of Jin Young novels though they are different stories. Both are the best adaptations of their respective stories. If you liked one you'll probably like the other. First time I watched Demi Gods & Semi Devils I dropped it because from the first episode, I thought the martial arts was too over the top, exaggerated and fake/sloppy. But after giving it another go a couple months later, I realized it was pretty well done (or at least maybe in its later episodes). So I Highly recommend either for fans of wuxia series. Lots of good martial arts action.
