There are a few advantages of owning a whole house humidifier. A whole house humidifier would be able to keep the entire house in a humid condition which is not something that a small portable humidifier can do. 

Having a whole house humidifier is convenient in the sense that you don't have to refill and maintain many portable humidifiers. Rather than spending money buying a few portable humidifiers and placing them all around the house, you should get a whole house humidifier to do the work. ...