The main advantage of SOAP-based SOA over ROA is the more mature tool support; however, this could change over time. Another SOA advantages include the type-safety of XML requests (for responses, ROA can also use XML if the developers desire it).

The main advantage of ROA is ease of implementation, agility of the design, and the lightweight approach to things. In a way, SOA and SOAP is for people in business suits; that’s what you’ll find used in the banking and finance industries. Conversely, somebody that needs something up-and-running quickly, with good performance and low overhead, is often better off using REST and ROA.

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