The only thing jay-z excels nas in is business acumen and record sales but artistically Jay isn't touching nas at all.
Jay is a better songwriter hence why he can make hits for radio, clubs, streets,backpackers,etc. He touches all fan base and that's why he has maintained platinum status for 20 years. Nas is pretty much a niche rapper compared to Jay.
Jay's flow, stage presence, beat selection,etc are way superior to Nas. SMH at Nas garbage double time flow on that Big Things track on I AM.