An O-1 isn't preferred but oftentimes is the only option for Canadians because they don't fall within one of the NAFTA occupations or there's some disqualifying

An O-1 isn't preferred but oftentimes is the only option for Canadians because they don't fall within one of the NAFTA occupations or there's some disqualifying element, such as a controlling interest in the petitioning/employing U.S. entity.