@Teso dos Bichos You're right, I have been sleeping on Royce Da 5'9's new shit:-
"100 in your mouth like Ted Dibease did to Virgil"
Check out InTeLL as well. It's U-God's son from Wu-tang:-
This is why they say Wu-Tang Forever, as they just keep breeding them!
It's too hard to say for solo rappers mate. I always change my mind and the top 3 could be out of a number of about 20 artists!
As for groups/bands:-
1. Wu-Tang
2. Mobb Deep
3. Gangstarr or Naughty by Nature