Most students ask which country is "better." That is the wrong question, because the two countries suit different priorities. The right question is which one fits your budget, your timeline, and what you want to be doing three years after you graduate.
Course length changes the total cost
A UK taught masters is usually twelve months. A Canadian one is often two years, sometimes with a co-op placement built in. A shorter course in the UK can end up cheaper overall even where the advertised tuition is similar, because you are paying rent and living costs for half the time.
Work rights after graduation
The UK's Graduate Route currently allows two years of post study work for most graduates. Canada's Post-Graduation Work Permit can run up to three years depending on your program length, and pairs with more established routes toward permanent residency. If staying on to work matters more to you than finishing quickly, that difference is worth taking seriously.
Work rights while you study
Canada generally allows more hours of part time work during term than the UK, which matters if you are planning to offset living costs while you study rather than relying entirely on savings.
What this means for you
If you want to finish fast and your funding is tight, the UK's one year masters often wins on total cost. If you are thinking about immigration long term and can fund a longer course, Canada is usually the stronger route. Neither answer is right for everyone, which is exactly why this is one of the first things we go through in a profile assessment.