The stats above are simply differences in boiling points, viscosity, etc between brake fluid types, not different brands. If someone has a similar table from one brand of brake fluid to another, for example, DOT4, then that would be convincing evidence to me that price would be a reason to change brands. If higher price translates to higher quality for someone, they are free to buy whatever brake fluid they choose. Likewise, if I choose to keep my supply of brake fluid for a shorter period of time than someone else, that, too is my choice.
Frank