I'm not going there on which was greater, Tiger at the Masters or Phil at the PGA. Tremendous moments in golf history that I will always remember. Add them to Jack winning the Masters at 46 and you have a trifecta. All 3 overcame obstacles the normal human would not.
Tiger did change his swing and had numerous health related issues to overcome. He won that Masters by being smarter than the young guns and playing to his strengths. He let the others self destruct and was the last man standing. His will to win is unmatched until he undercuts himself as a human being. Tiger is the only one who stops Tiger.
But so did Phil. Phil has remade his body and swing as well while struggling with a serious psoriatic arthritis illness that can mess up the joints, particularly of the hands and feet with pain and swelling. Which is why he had tailed off so much despite the talent. After taking a more holistic approach to health, he finally got his mind right late in his career, which is why he lost in the past when he should not have. He actually did it Tiger's way. Played smart to his strengths and let everybody else make the mistakes. He now gets 5 more years to play at that level through age 56. Will see what happens - hope he adds to his win total. He went to a level mentally I have never seen him go and he can still bomb it at nearly 51.
The common denominator in both wins - Brooks Koepka made mistakes he should not have. It's Brooks' turn to learn the lessons if he wants to reach the heights of Tiger and Phil. He has the game to be able to do it. The question will be his surgically repaired knees. He will have to adapt to the reality. Trashing a guy playing on a recently repaired knee that he cannot fully flex is a bit ridiculous as a few have done. It might be good to note that both Tiger and Phil think Brooks is one who could join their elite status. The have great respect for him.