Swift Alamofire VS AFNetworking
Use AFNetworking if you use Objective-C
Use Alamofire if you use Swift
AFNetworking and Alamofire are by the same people (the Alamofire Software Foundation), Alamofire is their Swift version whereas AFNetworking is the Objective-C version.
Feature wise they are the same.
If you are developing app using Objective-C then you must go with the AFNetworking.
Other wise if you are developing with the Swift then try the latest release of Alamofire.
In both the libraries Networking is done asynchronously. Only difference is Alamofire is no longer supported on iOS 7 due to the lack of support for frameworks.