&quot;We are going to migrate our vanilla js application to either React or Angular world&quot;<p>Does &quot;to migrate&quot; mean &quot;gradually refactor and gradually pack code in React&#x2F;Angular components&quot;. Or does it mean &quot;to rewrite from scratch&quot;?<p>How big is the application?<p>Does it have clear architecture and clean code or is it big ball of mud with ugly looking code?