Are faxes safer than scanned emails?

Some organizations will not accept scanned and emailed documents. They have to be faxed.

I don’t understand the difference in the technologies very well, but it seems to me a scan goes directly to the person you send it to, but a scan usually goes to a common fax machine and can be picked up by anyone in the area.

So what is the difference in the technologies that make faxes more secure than emails, if they are? Are phone lines harder to breach than the internet?