I'm gonna make this really simple for anyone that cares.
You can follow a lot of stats and hem and haw, but you really only need one.
That stat is what is the record of your team when they score first and how many goals do they usually win by when scoring first?
When you bet the NHL, IMO, you should be betting on the team that has a high chance of scoring first.
Especially when betting the Puck Line and IMO you should usually be betting on the Puck Line that will give you +150 or better.
I find that the +175 Puck Line is usually set wrong, and I like to hammer it.