AWS dropped a new cost-performance playbook pitting Amazon ECS against AWS Lambda. It's not just a tech choice - it’s a workload strategy. Go containers when you’ve got steady traffic, high CPU or memory needs, or sticky app state. Go serverless for spiky, event-driven bursts that don’t need a long leash.
Cost knobs to twist: Graviton2 (cheaper, faster), smarter scheduling, trimmed-down logs, compute savings plans.
