Specs are quantitative aspects of the option such as the price
Pros
Pro
Free trial available
SoapEngine is licensed software, but they do have a free trial available. The trial limits users to using the software on an iPhone or iPad emulator, however, so there's no testing on an actual device.
SoapEngine supports Basic, Digest, NTLM Authetication, WS-Security, Client side Certificate, and custom security headers. This gives the developer a larger number of options and approaches when it comes to securing their apps communications.
SoapEngine is a licensed software, meaning you have to purchase a copy of it. Single licenses start at around $15.26 and an enterprise license starts at roughly $91.65.