Khan, he has more options. Let me clarify: Khan has better opportunities, but if you mean "better year" as in winning, then I'd go with Golovkin. Khan has a high chance of losing to Pacquiao, Mayweather, & Brook. His biggest fights. Golovkin on the other hand, I don't see anyone south of 168 beating him.
The probabilities all favour Golovkin... Khan has big obstacles and challenges ahead...if he can overcome the odds against him he will easily trump GGG next year due to the opportunities available.