Tbh, when it comes to Jay vs Nas both of them has cemented their respective legacies in hip-hop but I think Nas has seriously surpassed Jay. In the first half of their careers Jay had the better overall catalog but it seems like every since '06 Nas has been running away with the shit.
Nas classics - Illmatic, IIW, Stillmatic, Untitled, Life Is Good, King's Disease, King's Disease II, Magic, & King's Disease III.
Jay-Z classics - Reasonable Doubt, Vol. 2, The Dynasty, Blueprint, The Black Album, American Gangster
It's like Nas went and got with Hitboy and found the fountain of youth or just hit the restart button it's crazy how he drop 4 straight classics (my opinion) in a 2 ½ yr span.