So different it's not even comparable, almost.
But as a rap group, Bone is better.
As a hip hop group Wu-Tang easily.
The difference between the 2 & there is 1 IMO is rappers are ill with a pen, paper & tight beat.
But the hip hop artist are more rugged, hard core. Honing there skills in freestyle & battle & are true students of the art of rhyme, whether it be on paper or dropping a hot freestyle on a dimee.