US Fisheries and Wildlife (with black and grizzly bears) suggests that bear spray is statistically more effective.
A 2008 study by Smith et al included two polar bear encounters where the bears were successfully deterred with bear spray.
However, in polar bear country you have other considerations, as the Nunavut visitor information says
Pepper spray ...
TLDR: While rare, it definitely happens.
In fact the majority of people killed by black bears in North America were killed by aggressive bears not by say surprised bears or mothers defending their cubs.
The study found that 63 people were killed in 59 incidents in Canada, Alaska and the lower 48 states. The researchers determined that the majority (88%) ...
There is not a huge amount of information on the subject of a Polar Bear Guard Training Course. It seems to be a three day course that deals more on deterrent methods and polar bear protection, than on shooting these bears, although this too is included in the training. I am going to limit myself to Canada, although other counties do in fact have similar ...
Campers in polar region are encouraged to adopt the following habit (taken from here):
Along the northern coast, near North Pangnirtung Fiord, the potential
for polar bear encounters is higher because of proximity to the
ocean. Hikers are encouraged to camp several kilometres inland rather
than on the coast.
Does this company take risks?
It will ...
I think this question is sufficiently similar to the other one that the answer will be identical.
It isn't safe. Of course this company is taking risks, as all exploration companies do.
There are many risks with camping or trekking in polar bear country. What you do is minimise the risks where possible, and accept the risks you can't minimise.
As @Amine ...
A difference on the side of the rifle would be that polar bears live in more open environments, so they're easier to see coming. A difference on the pepper spray side could be that these open plains can be windy, limiting the range and precision of the spray. So I figure the different approach might have more to do with environmental factors than bear ...
The Parks Canada website has this to say about the region:
East Coast Boreal Region
Natural Region 21
Wildlife characteristic of the boreal forest thrives here: moose,
caribou, black bear, red fox, lynx, snowshoe hare, wolf, spruce
grouse, raven. Along the coast congregate seabirds and waterfowl:
Atlantic puffins, ...
We carry both, a handgun (.45) and bear spray in black bear/grizzly country. A warning shot recently stopped a black bear from (bluff) charging LONG before it was within range of the bear spray. I deployed the bear spray as well, but it was carried sideways 10 feet by the wind and the bear would have to been much closer for it to be effective. Had it charged ...