Mystic Stylez was groundbreaking (over time) and highly influential, especially for an indy album
The End had some genius production, many incredible songs
World Domination is 3-6 at their peak, some of their most popular songs (TDCU 97, Hit A MF, Late Nite Tip) included
When The Smoke Clears was their big breakthrough platinum album, again with classic beats (Where Da Cheese At, Tongue Ring, Just Like Us, MEMPHIS) and songs (Who Run It, Sippin')
All 4 are hip hop classics, no doubt in my mind. Also all 4 albums' replay value and longetivity are top notch