The topic of this article is Google App Engine (GAE), which is a PaaS. Comparing GAE to AWS step functions (which is some wrapping around AWS Lambda) is moot since they are different categories of products solving different problems.
For PaaS products, GAE is comparable to AWS Beanstalk (or Heroku, or CloudFoundry, etc).
For "serverless" products * , AWS Lambda/Step Functions are comparable to Google Cloud Functions.
* Serverless in the product sense rather than the literal sense.
For PaaS products, GAE is comparable to AWS Beanstalk (or Heroku, or CloudFoundry, etc).
For "serverless" products * , AWS Lambda/Step Functions are comparable to Google Cloud Functions.