I’m assuming you have answered that question. I presume it’s for a standards based approach to interoperability. Since you are using it for that purpose, it would probably make sense to follow the standards. The WS-I Basic profile is the acknowledged compatibility standard for Web Services. WS-I says no to RPC/Encoded.
Here is a very good article explaining the differences in the styles and the pros/cons of each - [URL=“IBM - United States”]IBM - United States
#webMethods#API-Management#soa