I'd rank them in this order, from best to worst:
Dru Down
1. CAN YOU FEEL ME? (this is his most versatile CD, IMHO).
2. EXPLICIT GAME (introduced the incomparable team of DD with The Luniz).
3. GANGSTA PIMPIN' (some great songs in the beginning and middle, but it falters towards the end. Good, but not great).
4. PIMPIN' PARAPHENALIA (don't get this unless you see it cheap).
Rappin' 4-Tay
1. OFF PAROLE (4-Tay's most versatile and conscious record. A classic).
2. 4-THA HARD WAY (Basically of a piece with OFF PAROLE, with more features).
3. DON'T FIGHT THE FEELIN' (the production's a little dated, but it's worth the bucks).
4. BIGGA THAN THE GAME (a little more laid-back than usual, but good once you have the three CDs cited above).
5. GANGSTA GUMBO (not sure what happened here--4-Tay can still flow, but the beats are skeletal and don't match up well w/ the lyrics. Chalk it up to a bad day, I guess).
PEACE!