How do you consider players to be the best at their position when comparing past and current players?
You don't all anyone can do is share their opinions but there's really no solid evidence to back it up due to all the factors...
For examples, some goes by rings, some goes by skills, some goes by stats, etc.
Many considered Bill Russell to be the GOAT of the NBA mainly due to his 11 rings, many considered MJ due to his skills, stats as well as rings, some considered Wilt Chamberlain because of his dominance, etc.
Same for the NFL, is Trent Dilfer really better/greater than Dan Marino just because he has a ring and Marino doesn't?
Opinions vary...