The Hero Printer is the combination of the contents of both the Char Workshop and the Face Workshop, but with the added functionality of a character building tool!
Since they overlap, you can consider the Char Workshop to be obsolete. I will update both, however. Whenever new sprites are done - be it new animations, new shapes or items - both will receive said sprites.
If you don’t mind editing sprites yourself and want to save some money, go with the Char Workshop. If you want to save time and quickly hash out characters while sacrificing some degree of freedom, go with the Printer.