Personally I find Concourse to be better at CD than CI. We've been using it for a couple of years now to deploy Cloud Foundry which has a complex dependency graph of deployment steps. Concourse pipelines are great at modelling this, and resources like Terraform[1], Docker and S3 save you writing what would otherwise be a hell of a lot of Bash.

Disclosure: I run a company that sells hosted Concourse.

1: https://github.com/ljfranklin/terraform-resource