When comparing schemas and data, but in my case more important the schemas, it would be nice if a "rollback script" would be created. Like, if the comparison generates script "ALTER TABLE tbl ADD clmn int" then in addition to it a "rollback" file will be created with the statement "ALTER TABLE DROP COLUMN clmn".
It will help to rollback all the changes immediately in case of something got broken.
I just had this situation where I went from test to prod and I had to roll everything back because of some malfunctions appeared that were not seen in tests. So I had to get a whole DB from a backup and compare schemas again to remove things that were added.
With the "rollback script" it would be a matter of seconds but not dozens of minutes which I had to wait for the backup to get uploaded.