Whether you are talking about the St. Louis Blues or any sports team/player or any topic, really, it boils down to a matter of opinion when deciding who is the best of all time. Still, there are always things that are relied upon to help people make those arguments.
When it comes to coaches, the easiest way to decide is games won. Thus, it is hard to argue that Joel Quenneville is the best coach in Blues history, simply because he won the most games.
Despite the cold, hard numbers, some will argue for others.