Premier has a three-year warranty, while Quantum only has two years. Also, in the package, there are two filter packages, fine and ultra-fine for Premier. Other differences I consider are mainly the appearance. If I were you, I would take Nautilus CC Supreme; it has everything for the same price! Full filter indicator, cycle selector (3 cycles), extra-large filtration panels and smartphone remote control. Premier and Quantum are not connected to the smartphone app.