After the first 5 guys or so , it’s too hard to appease everyone . The idea of “best Defenceman “ is too broad and differs so much from person to person. My idea of a good Dman and Joseph Blow’s could be completely different.
Some place points and offence as more impactful or important than others.
Me , I take a D that is balanced and / or can play a shit ton of important minutes , either up a goal or down a goal late in the game ,I’d want the same guy on the ice. Protecting a lead or trying to generate offence . Not many guys like that though so I guess you have to prioritize what you feel is more important. I don’t want a guy that scores 70 points but gives up more than he generates.
I think you're scratching the surface of the issue with evaluating defencemen.
Dmen out of all the position IMO has the widest variation of style of play from player to player and that leads to people incorrectly evaluating defencemen.
Chris Tanev and Morgan Rielly are both good defenceman but they couldn't be any more different as players. If you judged them Ina bubble, I wouldn't blame you for thinking they both play different positions entirely. The root of the issue IMO lies with the fact that defencemen are called "defense" men which leads a lot of people to believe their primary role is to play defense. It's a very old term that harkens back to the days where positions were a lot more rigid and had strictly defined roles. Modern hockey is far more fluid than that. Defencemen in hockey should be thought of like Midfielders in soccer.
Lionel Messi and N'Golo Kante are bot midfielders but their roles couldn't be any more different if they played different sports. One is known for his offense and the other is considered the best defensive midfielder in his sport. Messi is gonna go down as a soccer goat so maybe it's an unfair comparison but it just goes to illustrate that a player's set of skills and the role he is given by a coach defines how effective he is at his position. If you made Messi play like Kante and vice versa, both guys would look a lot worse as midfielders.
There four primary fallacies that hockey fans commit when talking about defence IMO:
1 - Defencemen=defenders. I've mentioned this already but elaborating further, there are many teams who generate offense from their dmen first like Colorado and Nashville and there are many teams who's forwards are the best defensive players like Boston and Toronto. Related to this is that forwards are primarily responsible for offense.
2 - Defense is a singular skill like skating or shooting. Defense is a general term in hockey that encompasses many different skills and very few players are good at every single one. Just like how very few players are good at all types of offense. Some are better playmaker, others are elite shooters and others are good at the net front but nobody discusses offense as if it's a singular skill like they discuss defense.
3 - Good defense means you have good defensemen. The 2018 Islanders allowed 2900 shots in a season. The very next year they allowed 500 less shots. They made zero additions on defense in between those two years. They just hired Barry Trotz and he implemented a more conservative style of play. If you asked this forum which team had the best defense corps in 2018, nobody would have had the Islanders in their top 10. If you asked the same question a year later, a bunch of people would have said you'd be insane not to have them in the top 10. Defense is more systems based than player based IMO.
4. Offensive defensemen are interchangeable with wingers. The way a defenceman generates offense is very different from how a winger does it. They are not interchangeable.