Both types of licenses include the same features and allows installation on any number of computers per a license, but Personal license is restricted to non-commercial or educational use only whereas Professional / Business license includes all types of use including enterprise, professional and managed IT, non-profit and government use, plus priority technical and maintenance support.

In other words, if you plan to use WinCatalog at home, it is enough to buy a personal license. But if you want to use it at work or for your business, you should buy a professional license.