Sleepathy Original has the control button on the side which is more suitable for front and back sleepers while Sleepathy Max has the control button on the middle which is made for side sleepers and those who move, toss and turn while sleeping. Also Sleepathy Max has a dedicated eye space for those with long lashes or lash extensions in its 3D cup design.
For battery life, Sleepathy Original has 12 hours playing time if used continuously while Sleepathy max has 15 hours playing time. Both can last all night and may vary depending on usage.
Regardless, both masks have excellent quality.