British Columbia is host to an incredibly diverse amount of terrain, with endless stretches of pristine powder. There's a reason why many pro skiers call this province home. It also is incredibly accessible. BC backcountry ski routes are very well mapped, with zones and runs clearly marked on most interactive GPS maps. The fact that the region has been well skied means that you get to benefit from that knowledge base, and can find good conditions almost any date in the winter months.
The biggest benefit is getting away from the crowds. In most cases, you'll be shacked up with some close friends in a cozy hut far away from lift lines and crowded concession areas. Instead, you'll have the opportunity to connect with nature and each other in this high alpine retreat. Most people book Backcountry Skiing trips in BC for the camaraderie and escape.
Another huge perk is the conditions. BC is known as the heli skiing capitol of the world, and a lot of that has to do with snowfall and consistent conditions. British Columbia is a powder lovers paradise, and if you are willing to hike uphill, you'll reap the rewards. Ski season starts early in November/December and can stretch into late spring.