Axis2 is a
SOAP library that implements all major SOAP standards. Metro is exactly the same, maintained by a different group of developers, and also serves as the JAX-WS reference implementation.
wsimport is just a tool that is used for creating client-side
Java code for JAX-WS WS. You can't compare it to Axis2 or Metro.
See
https://coderanch.com/how-to/java/WebServicesFaq for starting points to read up on SOAP WS and the major Java implementations implementing them.