I do feel like "Firebase Cloud Functions" (GCF) is generally more polished than AWS Lambda. Lambda seems a little like it was slapped together and the UI often seems a little incoherent, which probably reflects their first mover advantages and disadvantages. It is not always straighforward to use the CLI tools for Lambda as well (but you can just wrap them in a bash script and forget about it generally). But, there are subtle gotchas with working in JavaScript (Promises!) especially within the context of a lambda/function. If you return the wrong thing inside your function or misunderstand the way promises work, you can get something that looks like it works and passes lint, but fails in production, and the logging pipelines for both AWS and GCF leave a lot to be desired.