WayOfTheFourElements
Hero
I liked the Planeshift articles, but have no interest in full settings.
I picked Amonkhet for the flavour, but for that reason I could go for Kamigawa as well and I hear good things about Eldraine!
There was also a set designed by Chinese Artist based on Chinese myth, the could put all 3 together and make a new KaraTurI voted Kamigawa. I could see Tarkir as well, but I like new monsters more than anything else.