Should I make a SOAP or a REST service to receive files from a .Net WCF Service? I need to implement a web service client in drupal 7 using the Web Service Client module,  which receives files from a .Net WCF Service. 

Should I make a SOAP Service or REST service using WCF such that the web service client can easily implement the file receiving logic in Drupal/PHP?
I have implemented SOAP based web service. And for file transfer I have sent the file contents as an array of bytes and it was successfully received in PHP.