Ranked in these QuestionsQuestion Ranking
Pro Generates everything you'd need to call the SOAP service
Sudzc generates a backend that gives the ability to call to the SOAP service. This includes being able to call to v1 and v2 Magento SOAP.
Pro Auto generates most all of your backend
Sudzc doesn't need anything more than a WSDL file, a namespace, and the type of code bundle to generate. From there, it generates pretty much your entire backend. It even comments the code!
Con Not specifically a library
Sudzc isn't specifically a library, but it's one of the easier ways to call SOAP in an iOS environment.