Well, it depends. But the good news is Jason Etcovitch (Engineer at GitHub) examines the pros and cons of each and where they fit. He even shared a comparison table to help determine which to choose.
Should your next automation tool be built in GitHub Actions or as a separate service with Probot? Since GitHub announced the beta release of GitHub Actions in October 2018, there’s been a new excitement around building automation - and that’s awesome! But I wanted to take a look at the various pros and cons of GitHub Actions and Probot, where each excels and where each might not be the best tool for the job.
Click through and scroll to the bottom of the post if all you care about is the comparison.