WebDynpro: is a UI (CAF ses WebDynpro as UI); ABAP-proxy alone is not enough, if you need additional persistency and code generated for access to persistency (local & remote)
ccBPM: is "only" a process-tool; if you need separate persistency and application-logic and UI, ccBPM does not offer you that.
WSDL: no UI, no generation of coding, no processes
Of course you can build a complete application with a combination of those tools, but it takes much longer and the coding is not as standardized as it is with CAF.
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