[tedmiston]

I used CircleCI a long time ago, just before and after 2.0, and thought it was fine.

These days GitHub Actions is awesome and full featured and does everything I want though without getting in the way. I doubt I'd use anything besides GHA unless I wanted to decouple from GitHub as a dependency.

Even then, I wouldn't be surprised if someone else hasn't already come up with an open source or local runner for the GHA yaml files as a stopgap.

[watermelon0]

Two downsides of GHA that I could find:

- you are limited to 2 core / 7 GB instance, whereas CircleCI offers up to 16 cores / 64 GB (for example, building software usually scales proportionately to machine size, and this can in theory be up to 8x faster on CircleCI)

- no support for ARM instances

[tedmiston]

The details you listed sound accurate for the built-in GitHub-hosted runners.

GHA also supports bringing your own self-hosted runners [1][2] where you install their agent, so you could, e.g., use an ARM instance on AWS with tons of cores. It looks like CircleCI offers this as well.

[1]: https://docs.github.com/en/actions/hosting-your-own-runners/...

[2]: https://github.com/actions/runner