Individually, few of his works stand on their own against the best out there at a given moment and time. There's no way a 7-8-year period of his could compare with some of the obvious greats.
But for longevity, continued ways to find relevance, variety, and for decades of doing his own thing regardless of what was expected of him, I'd have to go with Canadian and backyard homie, Neil Young.
When it's "of all time", it's about the sum of the parts and few of the parts individually. Which makes him sort of the Cal Ripken, Jr. of rock.