Hi @unique, welcome to the forum!
It’s tough to suggest things in situations like this as results can vary greatly depending on how the metadata is written to the image file.
If the image / video labels and ratings always live in the same blocks of the files (so they not grow not shrink n no matter the values) then Duplicati will only back up the small changed blocks.
However, if the metadata is store before the end of the file and causes subsequent data to change “location” then the updated data AND the following moved-but-not-changed content will be backed up, causing longer backups and more backend storage needs.
Your other choices seem to make sense to me.