Leetch was just better at controlling the game, a much better transition player and his difference on offense was greater than the one on defense imo. Chara had incredible longevity, but he also became a top defenceman later, and he wasn’t really a major difference maker for a lot of his final seasons. I don’t think there’s a large difference in the length of their primes, and I don’t put a ton of stock in accumulating useful seasons that are much lower than their primes for this level of player
I also think Leetch was probably underrated in his 30s due to playing huge minutes on poor Ranger teams. I know Machinehead did a deeper dive into his ‘01 season where he had 79 to lead all defensemen in scoring (significantly so over anyone other than Lidstrom), but he only finished 5th in Norris voting because his -18 made him look poor defensively, when Machinehead showed a lot of that was actually things like empty netters and short handed goals and Leetch was a huge positive impact on the team at ES. Chara always got the benefit of the doubt defensively when it came to Norris voting, which explains some of the difference.
Chara was a legit Norris contender for 10 years and a legit top pair defenseman for 20. Leetch was a legit top pair defenseman for 15 years, but his run as a true Norris contender was really only 6 years, albeit a better 6 years than any 6 years Chara can make a case for.
I get the excuses that Leetch was on a lot of bad teams, but he was a 50 point player that played a lot of minutes to bump up those stats from 29 year old and on. Pointing to his one outlier season in his 30s as a norm seems a little dicey. Leetch at 29 and on was good (well, until he got to Boston), but was not the Makar/prime Karlsson like force he was in his mid 20s.
And I think you are vastly overestimating the number of "useful tack on seasons" for Chara. He was still a legit top pair defenseman at 41 years old. His last season in Boston he was very much being carried by McAvoy, and the two seasons in Washington and NY were just there to get him past Chelios for games played. But, he was the Bruins #1D for most of his 41 year old season, before McAvoy clearly took the torch. That team made it to the Cup.
You can also make an argument that Chara was extremely underrated in his 20s because of everyones fixation with the ridiculously overrated Redden.
I think its totally within reason to conclude that Leetch's better peak puts him ahead, but I think you are needlessly overstepping in your arguments.
Leetch was tremendously talented, and not just extremely tall. He was also not supremely unlikeable as a player and person. Which is another advantage for Leetch. Who...despite the fact i should hate him as Canucks fan...i just can't. Chara on the other hand, can go kick rocks.
I think you know that what made Chara great wasn't that he was tall... there are a lot of 6'7" and 6'8
d-prospects that don't do shit... it was because of his awesome hockey IQ AND the big reach.