>>11837595 (OP)Depends on where you're looking.
Skillwise, I'd say they're about equal. Sure Robotnik has space stations, but so does Wily (the GB Mega Man games). I'd say Wily is the craftier of the two, being able to reprogram or scrounge together robots on top of stuff like the Wily Machines.
Then, of course, there's the X series, doubly if you believe that Isoc and Serges were Wily using robot bodies (that said, Wily loses some marks for Zero basically being uncontrollable).