PCL means printer control language and PS means postscript.
Printer control language (PCL) was released in the 1980s by Hewlett-Packard as a simpler, faster and less expensive alternative to PostScript-based laser printers.
PCL driver enables access to the maximum number of printer features, it offers limited capabilities. However, for everyday office color printing, this driver is recommended.
If you are printing color graphics or are performing desktop publishing, PS (PostScript) driver is recommended. Ideal for both Mac and Windows, this driver produces the most accurate color output.