title: Why is there a build.gradle and a build.sbt in play framework?
body: <p>I'm starting to develop a web app with scala. What I don't understand is why we have a <code>build.gradle</code> file and a <code>build.sbt</code> file. There are dependencies defined in both files. </p>
  
  <p>Which one should I use in what case?</p>