In my opinion you should know Spring MVC ( or boot ) as a Java freelancer. I'd also go with Spring because they have a huge market share and many projects requ

In my opinion you should know Spring MVC ( or boot ) as a Java freelancer. I'd also go with Spring because they have a huge market share and many projects require Spring knowledge. By knowing Spring you are expanding the circle for possible clients. Play/Dropwizard are nice frameworks but they don't bring you any value as a freelancer because nobody will require knowledge/experience in those frameworks.