What is the best solution: REST API Service-RDS?

Question

A customer has a RDS database and Windows Forms client application. He want to create a new client app. What is the best solution? 
Client->REST API Lambda ->(Cognito)->RDS
or may be 
Client->REST API NET Core service ->(Cognito)->RDS
Is it possible to publish the NET Core web service to AWS or it is better to use Lambda?

Accepted Answer

Hi, thank you for asking.

There are some options you can considered, but beforehand you need to specify the technical requirements such as performance, cost, traffic pattern, etc. 
For sure you can host . net core on lambda with lambda container , ref: https://docs.aws.amazon.com/lambda/latest/dg/csharp-image.html
Some options you can consider also if you are not familiar with Serverless yet, you can deploy .net core app with:
1. Elastic beanstalk: https://docs.aws.amazon.com/elasticbeanstalk/latest/dg/create_deploy_NET.html or containerizing the app so you can deploy with this option: https://docs.aws.amazon.com/elasticbeanstalk/latest/dg/create_deploy_docker.html
2. If app already in container and familiar with EKS, ref: https://aws.amazon.com/blogs/developer/build-and-deploy-net-core-webapi-container-to-amazon-eks-using-cdk-cdk8s/

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What is the best solution: REST API Service->RDS?

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