[aodin]

Although there is significant overlap between the two, I prefer Terraform for resource provisioning and Ansible for resource configuration.

[DerpHerpington]

Same, but now IBM will be able to merge them to create Terrible (or Ansiform). ;)

[rahkiin]

I like the joke. But a better integration between terraform and ansible for config would be pretty neat.

[freedomben]

Same. I view them like peanut butter and jelly. Terraform is my preference for new stuff and everything that isn't a stateful VM, and Ansible is my preference for managing manually created resources (which I try very hard to avoid, but always end up with some) and for managing VMs (even VMs created by Terraform). For stateful services (like a database cluster) Ansible is so much better it's not even a question, and for cloud resources (s3 buckets, managed databases, etc) terraform is a much better approach. I've never felt the two were really competitors even though there is some gray-area where they overlap.