Statistically, no one's come as close to match dominance relative to the field than Ruth did in his era. He was literally - in his time, worth almost twice as much WAR as Rogers Hornsby, who himself was a great deal better than the pack. I don't think - personally - we'll ever see someone as dominant in a professional sport as he was.
From 1919-1930 - ostensibly Ruth's greatest years, here's your top-5 in WAR
Ruth - 127.9
Hornsby - 103.7
Heilmann - 62.4
Frisch - 62.2
Speaker - 54.9
Gehrig - 49.7
I know I said 5 but listed 6. Gehrig was 6th just for the fun of it and to give perspective. That's.... that's terrifying. Imagine Lebron being a full 3 seasons of peak performance better than peak Kobe in his hayday and why even try... and i mean - that's 11 seasons.
The only thing close in the modern era have been Gretzky and Barry Bonds. And Ruth was harder to pitch to than Bonds in his prime - and what's scary is that it was totally worthless to even try to get Bonds out most of the time. Imagine that except worse. And Gretzky's stretch of almost lap the field dominance was far, far more brief. Once he was traded to Los Angeles, he was ostensibly a top 3 player for a while longer, but never came close to those 200+ points per season absurdity of the mid 80s.
Brady vs. Manning is the new Montana vs. Marino. Except i'd argue Brady was ostensiblly better than Montana and Peyton probably wasn't quite as good as Marino, but that's me more guessing. I'd wager Brady obviously benefitted from having a better front office, coaching and a cast that might not have necessarily been better, but was certainly better constructed and better constructed for him. Still, I find that 'Brady had better weapons or was a system guy' argument to be kind of silly. You're on the team you're on. Ruth also had Gehrig in his lineup and half an all star team. He certainly had more help than Bonds and nearly every other great hitter in baseball by a lot, but no one makes that argument that he wasn't great. He just was. And so is Brady. And Brady's weapons have been so changed out, flipped and turned over throughout the years, it's just hard to make that argument that he just had good support. He certainly has - but he's also changed a lot as a QB over the years.