cloud functions vs containers, when to choose which

hey everyone, i've been thinking a lot about deployment options lately. we're doing more serverless and containerized apps, but the lines feel blurry sometimes. when you're building a new service, how do you decide between, like, AWS Lambda or Fargate/ECS? are there specific use cases or architectural patterns that make one a clear winner? i'm just curious to hear your experiences and what you base your decisions on.