Since Season 8 starts soon I am a bit anxious. Which class should I start to play.

From the sets I don't know if I should take a Monk again or if I should go for something different since I am intrigued by the Witchdoctor but never played one.
I already know that I don't like the Crusader.

So, any class that you would recommend for Solo play during Season 8? (I am unsure about Monk, Barbarian or Witchdoctor)