Kind of hard, but I would have to pick boran fantasy.
Boran Lakorns:
1) Have better storyline (modern fantasy always have the Prake and Nake in the afterlife)
2) Cothing are thaiish to represent that it's in the thai feudal era..(not an immitation from other cultural, example Soi Saeng Jun customes is prettier becuz it's an immitation of the Egyptians.)
But I hated how they use poor special effects by using computer annimations in the boran fantasy ..you could totally tell, it's not convincing.. <_<