Difference is that IWW went double plat in 96 and Cube didn't go double plat until 2001.If it's 2x plat I think Predator and IWW are on equal footing, I have no idea how 6x plat showed up on the wiki page yesterday but it has changed now.
Ironically Nas himself cited Death Certificate as one of his greatest influences. Kendrick has spoken about it, I'm pretty sure Game has as well.
And Death Certificate transcends hip-hop, so its impact resonates with what is happening in the world today. Nas' album meanwhile may be praised for its lyricism, but all it is is an inferior attempt to replicate the sort of subgenre G Rap started and Raekwon ran with.
Not that any of this matters in the slightest.