SuperCI vs RunsOn: runners in your own cloud
Both start a fresh machine in your own AWS account for each job. SuperCI is open source and also runs GitLab CI, Cloudflare and Modal; RunsOn has been at it longer and does more on AWS.
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SuperCI beside the other ways to run CI jobs on machines of your own: what each is, where they differ, and when the other one is the better choice.
SuperCI vs Actions Runner Controller (ARC)
ARC is GitHub's own, and the right choice when you already run Kubernetes. SuperCI needs no cluster: it starts a machine for each job and nothing runs in between.
SuperCI vs the Terraform module for runners on AWS
Both are open source and start EC2 machines for GitHub Actions jobs. The module is infrastructure you deploy and keep with Terraform; SuperCI is set up from a dashboard and also runs elsewhere.