How does the coverage of APIs compare. Just AWS is a gigantic set of APIs. I see most of what I'd need in the Ansible Module Index but it doesn't seem like it covers all that is available.
Ansible has everything that's needed to automate instances, security groups, ELB, S3, RDS and few more things. I automated all the infra for a startup mainly with ansible (tens of services and a hundred hosts).
Terraform has better support for some static things, mostly VPC, routing tables, gateways. I've had infra retrofitted in terraform but honestly it's more for the show and as a documentation. Low level needs only be setup once and it's always been done manually forever ago.
If you were working around 2014-2017, both tools and many AWS services were new. There were significant gaps in support as well as a few bugs. Had to run from the beta build regularly. It is much better nowadays.
Unfortunately this is true - the Terraform AWS provider has thousands of PRs closed (and hundreds still open) as proof. Nevertheless, things seem to get support quicker in Terraform than in CloudFormation.
