The main difference is the wavelength, power, and level of treatment. For small, localized dark spots, the FacialPure Lite Upgrade is a simpler option. If you want a more professional system for different types and depths of pigmentation, the FacialPure 3.0 is the more advanced choice. It offers 532nm, 755nm, and 1064nm wavelengths with different treatment heads, allowing more flexibility for superficial and deeper pigmentation. For general dark pigmentation, we would recommend the FacialPure 3.0 if you are looking for the more professional option. However, it is a higher-powered device and professional operation is recommended.