One of the features of ReadyAPI that's worth mentioning is that it allows you to parameterize. I'm working with more than two hundred resources, so I don't have to go and make a small change at each point every time. I have the option to just parameterize in one place for the changes to reflect everywhere.
Another valuable feature of ReadyAPI is that it provides a customized environment. In my company, you work in different environments, such as QA, UAT, and LT, so the URLs for every environment are different. In ReadyAPI, you can customize your environment, set it up, then start working on it.
Another feature worth mentioning that's offered in ReadyAPI is automating your test value as the tool allows Groovy scripting. In your test case, you can use a Groovy script that says that in a particular test case, you have ten resources, but you just want to exhibit five and that you don't want to exhibit the remaining five. You can write a small Groovy script that lets you execute just five resources out of the ten resources.
I also like that ReadyAPI allows you to read the data from CFC and Excel. It also allows you to create or customize your data, but that only works at a certain point because every application has its specific data. ReadyAPI cannot generate every data, but when I'm posting and I want to generate a random name, such as a first name, I can do it in ReadyAPI.
The tool also has many different features which I find valuable, including Git integration.