I live in Saskatchewan and while we have a good population of moose to a non-resident (other than native land hunts) the allocation of Guided moose tags is pretty low. Where these take place are in the northern portions of the province(for the most part), large% of the hunts will be on boat via calling or checking feeding areas( bays), success rates are very good based on the locations and the hunt will take place near peak calling for the areas. You can find 50"plus moose but not the norm. I'd venture a guess that most ave in the 40's for bulls taken. Of course more remote locals may have closer to 50 as their camp average(float plane trips). Bonus is most of such location also offer some excellent fall fishing opportunites.
I'd say pretty equal to the east coast outfits from what I've heard. I suspect cost is the main reason why many don't venture this way however availability certainly would have a lot to do with it as well.
As far as best moose areas (beside the extreme north likes of the Yukon) Northern BC would get the nod. 50 plus bulls are more the norm but the cost indicates this. Most hunts in the northern remote BC areas will run 10K range but combo hunts are also an option.
Can't comment on Man. I hunted alberta years back with a resident buddy and I called in a 45"er for him that he took(biggest bull we saw that trip) - North of Fort Mac. Last fall I took a 49" here in saskatchewan on the draw via calling, best part is 3 hours from my door to setting up spike camp (this includes a wet 1 hour atv ride into the heart of the bush). Neither of these bulls are of trophy status by book measures but they were both wonderful hunts in the eye of the doer's. So it depends on want you want a once in a lifetime chance at a trophy class moose or just get to hunt them and let the cards fall where they may.
Check references thoroughly. Tip ask for hunters who haven't tagged as well, a lot of stuff gets over looked when a hunter drops the pin on his quarry. Just some advice from a former guide :wink: .
Best of luck.