Well in my opinion, Chen Jin was looking a little shaky in the match against Hafiz. He was choking on shots that were relatively easy. THough he did win the game eventually, he wasn't completely consistent and he looked well ... shaky. Chen Yu ,on the other hand, tends to be a consistent "I don't care but I'll do my best". While he isn't as aggressive as Chen Jin, Chen Yu is much more consistent. That just my opinion anyways.