I don't have a problem with either browser supplying credentials that the user has previously used and chosen to save on that particular domain/form/input.
The issue is that Chrome is randomly suggesting all sorts of data even when the last name field is for a medical patient rather than the doctor-user, or when it's a generic chat-message field, and when the user has never ever visited your website before.
Informing all customers that it's out of our hands and can only be stopped by disabling their personal Chrome settings is... Not practical.
[0] https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes...