The man-man defense aspect cannot be forgotten here. Both Gallant and Boudreau are man-man coaches.
But first of all, man-man defense vs zone isn’t black and white. All zone defenses has an element of man-man coverage and vice versa. Ultimately it depends on decisions made by the players, and the coach’s impact is more of a rule of thumb. But a team like the Islanders is of course strict zone while Bruce B is pretty strict man-man. I don’t know about Gallant?
Ultimately, I come from a man-man background and has seen a lot of man-man hockey during my up bringing.
But when looking how extremely loose the NHL game is right now, when even a strict defensive team like the Islanders will have two Ds pinching in at the same time, backhand drops inside the blueline while a line change is taking place, forwards challenging Ds 1 on 1 no matter the score or time left on the clock — things that are total no-go’s at most places just 5-10 years ago — I wonder if the stability of a zone defense isn’t to be preferred?
You can also be very effective offensively despite playing a zone defense. That is the big difference, you play man man to not stand still when you play defense, I.e. to already have speed under your skates when you win the puck. But like look at Philly this year, I think it’s risky to go man-man, especially in our division. How will the schedule be next year?