Both PCL and PS Drivers are page description languages which are used by the printer for printing documents. PCL is developed by Hewlett Packard, while PS Drivers or Postscript is developed by Adobe Systems. While postscript is used mostly for laser printers, PCL is used for both laser and ink-jet printers. One of the major differences between the page description languages is that postscript is usually used for accomplishing complex tasks, while PCL drivers are used for not-too complex tasks, and they are faster compared to PS Drivers.
PS Drivers are designed with more functions compared to PCL Drivers that is why it is quite popular. When you are using PS Drivers, you can send your information to the printer in plain text or binary format while you can only send your information to the printer in the binary format. In terms of quality, PCL doesn't produce good quality as PS Drivers.