So I'll give two:

In the SMJHL, Colorado has the best home ice advantage due to the altitude in Denver. At a mile high, the Raptors players are accustomed to having less air flow and can still work within that, but their opponents are so quickly moving from one city to another that they have no time to adjust and will be exhausted by the third period.

In the SHL, I have always believed in a major home ice advantage for Edmonton. I don't know the specific reason, it may be the distance traveled to get to the city thus meaning players get less sleep, it may also be the weather in the city as it's known to be colder and could lead players to be a bit more uncomfortable throughout their day, it may be that the team continues the tradition of having one player take a nasty shit in the opposing locker room from back in the teen seasons that we had continued to the S30s at minimum. Whatever it may be, Edmonton has a hell of a home ice advantage.