For the last 5 years, my practice has used Onebox for incoming phone and faxes. All incoming faxes arrive as pdf files. So they are really easy to save in an AC chart -- often without ever printing.
Until a few months ago, we had 2 Brother multifunction printers. But both they and the native MS fax software were never easy to use and didn't seem to work at all in some situations. We often had to print then fax the paper.
3 months ago, replaced these with Canon pixma 870s (were <$100@Costco). The included software is fabulous! Now we hardly ever print first. When we want to fax, we select the Canon fax printer, and it dials and sends every time. No monthly fee!