We have used other tools Smart Pair Complete is more on the UI side, and Jamie is for API performance, whereas ReadyAPI is for API code. ReadyAPI is on the API automation side, but with it allows you to do more custom coding.

I used IBM Green Hat, Datasoft, etc.

We also use ServiceV Pro, which is from the same vendor, SmartBear. ServiceV Pro is used for stubbing, mocking, or virtualization of the services, whereas SoapUI is used to automate the services or the API.

So, if you want to do automation, you can use SoapUI Pro, but if you want to remove any dependencies related to other services and you want to mock or stop it, then you can use ServiceV Pro.

So in my project, two tools were used: Postman and SoapUI Pro. In my organization, most use SoapUI Pro because it's easy to use. There are many more automation features actually in the Pro version of the SoapUI. I am not sure about Postman because we were using it a very basic level. I'm not sure whether automation is possible or not in Postman, but in SoapUI Pro it definitely is. 

We did not evaluate other options. We tried SoapUI first and its REST Discovery feature convinced us to adopt it.

We evaluated SoapUI, SOATest, UFT.