Email is usually the easiest way to send a document, but it is not accepted everywhere. Healthcare offices, courts, insurers, government agencies, and older business systems may still require fax.
Email is better when the recipient accepts it
If the recipient gives you an email address and says email is acceptable, use it. It is fast, searchable, and easy to forward.
Fax is better when the process requires it
If a form says to fax the document or an office gives you a fax number, do not assume email is an equivalent substitute. The department may route faxed documents differently.
Online faxing is the middle ground
Online faxing lets you send a fax from a computer or phone without owning a fax machine. For occasional use, pay-per-use keeps the workflow simple.
Use the channel the recipient expects
The best delivery method is the one the recipient will actually process. When they ask for fax, an online fax is usually the simplest way to meet that requirement.