1 vote for splitting hairs.
I think a really viable comparison would be Pinehurst #2 with Royal Melbourne. Both are inland links courses, so I would suspect that those with experience on both (I don't know Mel...I'll never be royals) could declare.
OK ... I know both courses pretty well. And I gave them both 10's on the Doak scale. Split that however you want!
I admire the work of both men. And I've always said, I prefer to rate courses, not architects.
I think it's generally correct that Ross's strength was efficiency of routings ... which also enabled him to crank out so many more designs. Maxwell did not have to worry about that so much, as a lot of his work was on bigger properties in less highly-developed parts of America. He did not do the routing for Crystal Downs, so it's silly to give him full credit for that course.
Maxwell tended to defend his greens from the inside more than the outside. He did not do as much fairway bunkering as Ross, perhaps because the greens were so well defended.
Saying one was better than the other seems pointless to me. Both were great talents.
All that said, I think there are a few people working in the business today who are comparable to Perry Maxwell. But there is absolutely no one whose work is comparable in quantity and quality to that of Donald Ross.