Although the company may want you to think otherwise, unionized workers enjoy better wages and working conditions than non-union workers. This is true sometimes even within the same company, like Suncor. In a non-union workplace, you can be fired for almost any reason that your boss thinks is right.
In a unionized workplace, you are guaranteed protection against that kind of action. There is also a process to address and resolve workplace issues in an open and transparent manner, called a grievance procedure. You also have the protection and resources of a union at your disposal, which can help level the playing field in workplace.