When comparing Quarkus vs Spring-boot, the Slant community recommends Spring-boot for most people. In the question“What are the best microservices frameworks?” Spring-boot is ranked 2nd while Quarkus is ranked 6th. The most important reason people chose Spring-boot is:
Boot is just a thin configuration layer over Spring Framework, as such it inherits all the strengths of Spring.
Specs
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Pros
Pro Container first
Minimal footprint Java applications optimal for containers.
Pro Open source
Pro Very fast startup
Pro Tiny memory footprint
Pro Automatic hot-reload
Pro Inherits all of Spring's strengths
Boot is just a thin configuration layer over Spring Framework, as such it inherits all the strengths of Spring.
Pro Preconfigured starters
Pro Fast prototyping
Spring boot is built for fast prototyping.
Pro Kick down to Spring
Cons
Con Lacking in UI development
While actually very good and with a very complete and rich feature set to develop and maintain code on the server side, it still doesn't provide any rich framework for building good user interfaces.