With Liquibase, when you write changesets using SQL, you have to write the rollback code yourself. When you write them with Liquibase's built-in operations in (for example) XML, the rollback is derived automatically.

I write SQL almost daily, but for the things that can easily be expressed with Liquibase's operations, I can write them faster and with fewer errors in XML, so long as I'm using a text editor with XML schema support (hence: autocompletion and validation as-you-type). PyCharm works well for this.