What are the pro sports?
Soccer. Maybe Pele.
Football. I would say no. No one was clearly the best player for 13 consecutive years.
Hockey. Agree, if it was anyone, it was Gretzky. But he actually only led the league scoring 8 consecutive years. After that, I think LeMieux passed him. Only won 9 Hart Trophies (for MVP). His legacy was tarnished some when he was traded to LA and failed to win any cups there.
NHL & WHA Yearly Leaders and Records for Points
www.hockey-reference.com
Babe was dominant for a long time. Led the league in OPS 14 of 15 years...the only year he didn't, he was not well. You can argue he was the best player in baseball for a couple of years earlier than this as well, when he was one of the best pitchers in baseball, as well as one of the best hitters, when he was primarily a pitcher when he first came up with the Red Sox. Not sure Lebron has dominated the sport of basketball like Babe did baseball either. Though he has been amazing for a really long period of time. Leading the league in assists this season for the first time is particularly impressive to me.
Check out the latest Stats, Height, Weight, Position, Rookie Status & More of Babe Ruth. Get info about his position, age, height, weight, draft status, bats, throws, school and more on Baseball-reference.com
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Cobb had a great stretch where he led the league in hitting 12 of 13 years but I don't think he was as dominant as Ruth was in other categories. Led the league in OPS 8 of 9 years, which is amazing, but not quite as amazing as what Babe did. Especially given Babe was also a great pitcher.
I would go with Babe as the more amazing, longer dominant streak, but Lebron is getting close and you could argue his sport is more demanding on the body than baseball.