For me, it's the "intangibles" that the Bruins bring that will hopefully sway the series in their favour.
I think the leadership that Bergy, Brad and Foligno (and others) bring will be key. Jake, I feel (hope), will be on a mission to "make his mark" these playoffs. I think Lindholm will also want to prove himself, being a recent acquisition (signing). Speaking of Lindholm, interestingly (according to NHL.com), in 2015 playoffs, he had a four-game playoff point streak, the longest by a Ducks defenseman since Pronger (in 2009), and he finished those playoffs tied for sixth in scoring among defensemen with 10 points in 16 games. Here's hoping for more of that! I also think Hall, being a veteran but with only 3 years exepriencing playoffs will be hungry. Obviously, goaltending will be huge, and will be a key factor for both teams.
Having said that, that's not to say there's not similar factors on the Canes side; but I think the character of those mentioned above will be a "swing factor" for the good guys. Have a good day.