ok so
@JayBaldacci stepped to the plate and offered up basically the years 1994-2002
but Jay...you can't just ignore the two weed plates that broke up Nas' "prime" into two segments. In fact, the Stillmatic era was a renaissance not necessarily a prime run. But if you gonna include it, you gotta include those two lacklustre albums sandwiched between IWW and Stillmatic. I don't blame you for trying to extend to 02 either otherwise if we real about it, Nas' prime is 1994-1996, and that's not good enough.
so I'll let you have it.
Nas (1994-2002)
Illmatic
It Was Written
The Album (w/The Firm ----> 1/4 credit)
I Am...
Nastradamus
Stillmatic
The Lost Tapes
God's Son
so therefore I'm gonna go for an equal duration and say Cube 88-96
Ice Cube (1988-1996)
Straight Outta Compton (w/NWA ----> 1/3 credit)
AmeriKKKa's Most Wanted
Kill at Will (EP)
Death Certificate
The Predator
Lethal Injection
Bow Down (w/Westside Connection ----> 1/3 credit)
let's ignore the fact that I'm including Lost Tapes (compilation) for Nas but leaving out Cube's bootlegs and b-sides
let's ignore the fact that I'm leaving out Da Lench Mob album in 1992
let's ignore the fact that Cube wrote the entirety of Eazy-Duz-It in 1988
let's look at what's in front of us
not one album on Cube's list is anything less than 4 mic worthy
Nas has two duds and The Album is a disappointment
comparison between these two is in the words of

asinine asi10 asi11 asi12.