It's the list stupid . The list and the offer are the most critical components of a successful mailing. Make sure to invest the appropriate time to make it right. Mailing by design . If you don't have an in-house design team, some services offer design services that you can tap.
Stamps work .
It may cost more, but you may find it's worth it. Assuming that you have the mailing design under control, deciding which mailing service to use should be based on their ability to meet your requirements. If anything needs to be collated, folded, or stapled, or inserted, that should be addressed, too. You may also need a mailing list. Many mailing services offer them for sale, but you can also use lists from your own sources.