I'd argue the point although I did throw it out there just to start something. I was referring to Williams and didn't do any math on the years. I should have prefaced it by saying pure hitters and I've always been under the impression that the two had the sweetest swings......
Productivity Index [On-base % + Slugging Ave] is an Elias metric that's quite powerful. Anything sum over 1.00 indicates superstardom, whether for a season or career.
Sorry for the formatting. I can't seem to get it to square up for good reading. For their careers,
Williams is .482 + .634 = 1.116
Gwynn is .388 + .459 = .847
Williams is nearly a third better in productivity, which is an astounding gap between the two hitters, and neatly indentifies the tier into which each player rightfully belongs.