Best way to move mail from one server to another

I’d like to migrate to a new server. I only need to transfer the mail store, have already done the users. I’ve seen different recommendations:

IMAP-Sync Rsync Doveadmin backup and dsync

What are the pros and cons of each? What would be best for me? I’m thinking that Doveadmin backup is the way to go.

Both old and new servers are on same network. New server is running Dovecot 2.3.2.1, old server is 2.2.32. macOS X.

Does anyone have any advice or examples?

Thanks, James.