Ansible is only declerative on a action level. At a playbook level it's imperative. You can install and remove the same package within a playbook, the outcome will be dependent on the order.

Puppet is fully declerative but for me it lacks an easy way to undo changes. It would be nice if it could work like Terraform where it keeps a 'state' of all changes it made in the past so when you remove a resource from your config it could 'undo' the change.

I still use Puppet (mostly with Bolt nowadays) for systems that don't fit Kubernetes, but they're becomming less and less.