I switched to mbsync from offlineimap about four years ago. I was having issues with offlineimap hanging during sync, as well as slow performance in general.

I switched to mbsync and have had zero issues since. Just set it and forget it.

mbsync tends to be more efficient and robust. With Gmail it has no problems. With outlook IMAP it has problems with some emails occasionally. I haven’t figured out how to sync Maildir with Office365 other than cloud-mdir-sync which is inefficient for large mail boxes.

I switched from offlineimap to mbsync. I can't remember the details, but I remember having lots of various issues with offlineimap but I can't remember any issues with mbsync other than once I think I had to change something in my config after an upgrade.