Depends what you are looking for when judging both tracks. I prefer difficult, emotional tracks like that win me over. It's like looking inside Eminem how dark he was at the time, what he was going through the emotion there is of a very unstable person. Can't compare the emotion on that track to YNO where he is not exactly got over Proof's death but accepted it if you know what i mean. Eminem's outlook on proof's death in 2010 is different to 2006. There are five stages of mourning,
Denial and Isolation,Anger,Bargaining,Depression,Acceptance:[2010 Eminem]. Bargaining and Depression appears to be seriously present in Difficult.
From a lyrical stand point YNO>Difficult. But as a track Difficult>YNO. The YNO chorus was a let down. But both tracks are great for what they are.