HP has the advantage that when you replace the ink cartridge you are at the same time replacing the print head which is integral with it. This means that you always have a new print head. The disadvantage is that you are then also paying for a new print head, and if you buy compatibles, you are really buying refilled old HP cartridges. Epson has the advantage that the ink cartridge is really just a box of ink, and therefore much cheaper. The disadvantage here is that if the printer is left unused for a long time, the ink can dry in the print head and is often impossible to clear. As the print head is part of the printer, it is usually cheaper to buy a new printer than to replace the print head.