The advantages of using SoapUI are as follows:

• SoapUI can run load tests (Load testing is a type of non-functional software testing in which a software application's performance is evaluated under a certain load which determines how the software application operates when numerous people access it at the same time. Load testing is used to identify performance bottlenecks and ensure the stability and smooth operation of software applications prior to DEPLOYMENT), scenario-based tests (Scenario-based testing is one way to document the project's software specs and needs. 
  Scenario-based testing is a method of designing tests for INDIVIDUAL user scenarios in order to ensure that their job is correct. Scenarios focus on the most important goals and requirements. The scenario passes if it runs from beginning to end. Scenario-based software testing may be described as an inspection-based collection of tests that are run to ensure that the user can execute the specified actions from start to finish. 
  There are alternative ways to depict scenarios, such as a table with the first column describing the user's actions and the second describing the system's response), and data-driven tests (Data-driven testing (DDT), also known as table-driven testing or parameterized testing, is a software testing methodology that describes testing that USES a table of conditions directly as test inputs and verifiable outputs, as well as the process of not hard-coding test environment settings and control. In its most basic version, the tester PROVIDES inputs from a table row and anticipates outputs from the same row. Values that correspond to BORDER or partition input spaces are often found in the table. The test configuration is "read" from a database in the control approach) automatically.
• It has the capabilities to generate reports for the tests performed using it.
• SoapUI provides the unique ability to impersonate Web services and perform functional and load tests against them prior to their execution.

Functional tests are organised using three layers in SOAP UI:

• Test Suite: A Test Suite is a collection of test cases that are used to group functional tests into logical units.
• Test Case: A Test Case is a collection of test procedures used to evaluate a single feature of your services. Any number of Test Cases can be added to test suites.
• Test Steps: In SOAPUI, Test Steps are the "building blocks" of functional tests. They work together to create Test Cases, which determines the service's execution flow.