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You can debate this choice all you want, but Patrick Roy can't hear you with his Stanley Cup Rings in his ears.
Roy is unquestionably the greatest goaltender of all time in my mind. His 151 playoff victories are the most by any goaltender in league history. His 23 postseason shutouts are tied for the most ever, and he has the most Conn Smythe Trophies (three) of any player in the history of the game.
A goalie like Patrick Roy allows a team to play a run-and-gun type of offense such as the system Colorado ran for much of Roy's time there.
However, Roy's success was not limited to just one team. He won a pair of Stanley Cups with both the Montreal Canadiens and the Colorado Avalanche.
Having a presence like Patrick Roy between the pipes is more valuable to a team than any goal scorer could ever be.