What are your goals? If your goal is to build something to have a product/service/business, build what you know. That will let you build and iterate quicker. S

What are your goals? If your goal is to build something to have a product/service/business, build what you know. That will let you build and iterate quicker. Startups don't fail only because they were built on <framework A> instead of <framework B>. If your goal is to learn a new framework, just pick one and give it a shot! There are many concepts you can learn that extend across stacks. If your goal is to list languages/frameworks on your resume, that's a little tougher. One not very scientific way to decide is to do a brief search for job listings in your target location and pick the BE mentioned most frequently.