We all know McAvoy are playing on a much better team. Flyers where really bad espescially the first half of the season. Its quite pointless to compare two players who are used so differently and when the quality of the teams they play on have a lot of difference.
What sounds like the easier job: An offensive defemceman for one of the best team in the NHL or defensive defenceman for one of the worst teams in the NHL.
One player is set up a lot better to succeed. I agree Provorov wasnt as good as his 2017/2018 season. I think Provorov's 17/18 was better than McAvoy's second season in 18/19. McAvoy will probably have the better third season in the NHL. Still gong forward it will probably be close.
Looking purely at zone starts isn't a great way to say one guy is a better player than another. Neither is "plays on a bad team so he must be better". I appreciate that those are pieces of information, and that's what I was adding with the graph I posted. I didn't say it was CHECKMATE.... just that it's another thing to consider and I would argue that the difference shown is a difference not explained by teammates or zone starts. But that's arguable.
But one of my points, you didn't really mention, was that the differences in team is indeed a factor in % of zone starts, so the other PHI fan who said that McAvoy gets "easier" shifts isn't really telling the whole truth. I can't post this chart, but you can go to:
Player Usage Chart - Frozen Tools
Choose just BOS and PHI for teams, then for players just select the D on both team. You'll see that 4 PHI Dmen started more than 50% of their shifts in the Dzone and only 2 in the Ozone. BOS on the other hand has 4 guys in the Ozone and only 2 in the Dzone (I sorted it so it only included players who played 25 or more games last year).
So was McAvoy being "sheltered" or "protected" or is BOS a good possession team that gets a lot of shots that lead to Ozone faceoffs? Of the BOS D who had >50% OZ, McAvoy had the highest quality of competition.
Now Provorov absolutely faced the toughest comp on either team, but he had the 4th highest DZ%... so it wasn't like he was the go to guy in those situations (or more likely, they wanted to use his offense more than the 3 guys who had higher DZ starts).
Finally, you are making a big mistake in thinking "One player was set up to succeed and one wasn't." The mistake you are making is thinking that hockey is like football with every play starting in a stationary position at a faceoff. Many shifts start on the fly, and many faceoffs occur on the a shift that started on the fly. As I showed, BOS just had a lot more OZ starts than PHI. I'd argue that McAvoy wasn't "gifted" OZ starts... I'd argue that he (and his teammates, but believe me he was a big part) EARNED them by getting the puck, and getting it into the OZ.
Both are very good young D with long careers ahead of them. I can believe that neither team would trade 1 for the other. But I think dismissing the season of each last year as just zone starts or quality of teammates is a big mistake, especially since PHI isn't exactly lacking talent.