AWS Lambda vs Cloud Functions: Which FaaS?
AWS Lambda is the most mature, widely integrated FaaS; Google Cloud Functions is a clean event-driven FaaS tightly tied to GCP services.
Lambda has the deepest ecosystem, the most triggers and integrations, and features like layers, provisioned concurrency, and SnapStart. Cloud Functions offers a straightforward event-driven model integrated with GCP (Pub/Sub, Cloud Storage, Eventarc), with Gen 2 built on Cloud Run for more power. Lambda favors breadth and maturity; Cloud Functions favors GCP-native simplicity.
| AWS Lambda | Cloud Functions | |
|---|---|---|
| Maturity | Most mature | Mature (Gen 2 on Cloud Run) |
| Triggers | Vast (many AWS svcs) | GCP events, HTTP |
| Cold starts | Mitigations available | Improved in Gen 2 |
| Ecosystem | Largest | GCP-native |
| Best for | AWS-native, broad triggers | GCP-native event apps |
Use case and integrations
Lambda fits AWS-native architectures needing many trigger sources and mature tooling (SAM, CDK). Cloud Functions fits GCP-native event processing and HTTP endpoints, with Gen 2 closing the gap on concurrency and runtime limits via Cloud Run. The choice usually follows your cloud.
In CI and deploy
Both deploy via IaC or CLI from CI using OIDC for keyless auth. Either deploys from managed runners, where faster runners shorten packaging and deploy steps.
The verdict
On AWS or needing the broadest trigger and tooling ecosystem: Lambda. On GCP wanting simple event-driven functions (with Gen 2 power when needed): Cloud Functions. The decision is almost always dictated by which cloud you already run on.