The main difference between a corporate vision and a company's big hair audacious goals is the level of boldness or daring involved. Generally, vision is more reasonable and there is consensus that the goals of the vision can be reasonably achieved. BHAGs, on the other hand, are more like moonshots that have some likelihood of success, but might also fail. BHAGs are riskier but bolder, and if they do succeed can be quite groundbreaking.