Some time ago our company consults to our clients that started working on Facebook Store application that should be able to integrate with Magento. After quick overview of Magento API documentation it was clear that we need to select one of the two API methods provided by Magento - SOAP or XML-RPC. First version of Magento Facebook App was developed with SOAP version of API. And then it starts ... Since application should be able to communicate with different installation of Magento, we've learned a tons of bugs for each major Magento version. After more than half year of fighting with SOAP and become an experts in Magento API bugs, we decided to give a try to XML-RPC. And here was very nice surprise that we already didn't expected from Magento developers :-). Almost no bugs related to Magento installaion ... So for everyone checking Magento API - SOAP vs XMLRPC - the absolute winner is XMLRPC.
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