AWS has its own Serverless Application Model (SAM) https://github.com/awslabs/serverless-application-model released last Oct. Rather than learning another framework, you'd use the same CloudFormation yaml syntax to define your stack and apps. It simplifies calling Lambda functions by providing a higher level abstraction triggers called Events. This makes it simpler to create Lambda functions for Rest API, Cron schedule, IoT devices, create Alexa skills, response to S3 events etc. Then its just "aws cloudformation package" and "aws cloudformation deploy" to create and update your app. It appears AWS team is learning the best from Serverless Framework. If you not mind the vendor lockin, SAM is the way to go. Serverless Framework has the promise of using the same tool against AWS Lambda, Google/Azure Functions and IBM OpenWhisk.