Should I create a GitHub App or GitHub OAuth App?

I am trying to create a website that will allow users to authorize their GitHub account and it will then allow the user to click a create button. Which automatically creates a new repo with some files. Now I am confused about should I make a GitHub app or OAuth app for the same. I have looked into the documentation but still confused.. I will host the website and this will allow any random user with an GitHub account.. What will be the best choice?