You asked which brand is best, in the thread title and in the original post.
You did not ask which company makes the best cameras, but rather you asked which company has the best brand. . Yet, some people are answering your question as if you had asked about cameras, not brands.
To answer the question in accordance with the way it was first asked, we should look only at which company has most effectively developed their brand and not at which company makes the best cameras.
Canon would seem to have the upper hand as far as branding is concerned. . Their camera brand appears to be the world's most recognizable brand among camera manufacturers. . That is how success is measured.
When I Googled "camera brands", guess which one consistently appears at the top of most of the lists ....... yup, Canon.
I think that if you could poll 100 million randomly chosen people worldwide, asking them, "name a brand of digital camera - the first one that pops into your head", that more people would respond by saying "Canon" than any other brand in the world. . That makes Canon the "best" brand, because when it comes to branding, instant recognition and familiarity are what count, and this is what Canon has over all of the other manufacturers.
Now if you had asked which camera manufacturer makes the best cameras, or which company's cameras give you the best value for the dollar, then it might be Canon, but it may very well not be Canon - it could be Sony or Nikon, or some other company. . But in the thread title you didn't ask that - you simply asked which brand was best, not which cameras were the best.
By the way, Leica and Hasselblad have developed very prestigious brands. . But they are niche brands that target a much narrower demographic than do the Nikon, Canon, Sony, etc brands. . The real measure of a brand is the amount of gross profits it can generate, and "everyman" brands that appeal to millions upon millions of potential buyers will generate higher overall gross profits than will niche brands, regardless of what kind of esteem the niche brands are held in.
"Your" and "you're" are different words with completely different meanings - please use the correct one.
"They're", "their", and "there" are different words with completely different meanings - please use the correct one.
"Fare" and "fair" are different words with completely different meanings - please use the correct one. The proper expression is "moot point", NOT "mute point".