both masters of their craft

at the end of the day its which 'sound' speaks to you more

if thats not good enough for you i will say this

i think rza has the edge on that prototypical 'hip hop production' in the way we nostalgicize it.

for example im certain the rza is a more experienced digger, has chopped more samples, etc

dre has a different approach that for whatever reason some folks will never see as legitimate

but at the end of the day they both create backdrops for rappers

the salient point is here:

i dont think u can judge ones 'skill' over the other. because they rely on different skill sets

what u can say is which sound u prefer. for me, its a toss up