Manny Pacquiao is the most popular boxer in our time ,yeah he is older than this fighter but remember how many Big names with younger ages but Manny break them inside the ring.
Your devotion to Pacquiao seems to have blinded you. And it seems to me that you have never watched a single fight of Golovkin. If you had done so, then you would have never asked this question. Golovkin is unarguably one of the best boxers of 21st century. The fact that he was robbed of victories against Canelo not once, but twice can't take that away from him.
I would say both the fighters are good. But Golovkin is in another weight class and that gives him the advantage.