SoapUI is not a paid tool. It also has an open source community version. It is also platform independent. I am a big fan of Soap-UI, and I feel that there is no reason not to use SoapUI.
Choosing SoapUI is not just about writing tests. If you have a wsdl / wadl description file, you can import them, and you can automatically generate tests for your API without any effort, and your life will be much easier.
It has many plugins available for easy integration with emerging trends around the API, such as Swagger, RAML, BluePrint API and CA developer portal, JIRA etc. Also, the support you are going to get from the SoapUI community will be awesome.
Linkesh Kanna Velu
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