No particular advantage other than I'm very familiar with them and that leads to faster and better development.
AWS is a back-end stack? I think you are confused on what is a back-end stack.
Well, I use AWS Lambda, AppSync and a bunch of others. I believe they power my app from the "back", so I just call them my back-end stack.
We're a place where coders share, stay up-to-date and grow their careers.
We strive for transparency and don't collect excess data.