title: When to use Promise over observable?
body: <p>Is there any case, where Promise is more powerful as compare to observable? I know a lot of benefits of observables over promises. But Is there any case, I should use only promises over observables. </p>
  
  <p>I found this link, <a href="https://stackoverflow.com/questions/37364973/promise-vs-observable">promises vs observables</a>. But this always shows me the benefits of observables over promises. I want to know the benefits of promise over observables.</p>