What are the advantages of REST over SOAP which is more secured

Hi,
 
I am developing this component framework in C#.Net Framework 4.0 for my company. In this component framework I accept components and methods runtime (through reflection) to call on specific event occuring within system.
 
I have developed this framework which I want to enhance further to support web service calls (REST or SOAP). I have seen that REST is relly well embedded in ASP.Net MVC architecture for calling controller methods mostly.
http://rahulajoshi.wordpress.com/2012/05/05/rapid-development-framework-part-1/[^]
http://rahulajoshi.wordpress.com/2012/05/25/event-notification-engine/[^]
 
In my framework event notification component only accepts events and calls subscribers to this event with event arguments passed to it and all other data is shared using sessioncontext web service. So eventually I want to just make a call to web service which is one sort of subscriber to event model that I m implementing. Once a web service or local component methods is called internally they should look for data in SessionContext web service for same a unique EventID is passed through event arguments.
 
So my question is for same should I use REST or SOAP or any other convenient web calling method.
 
Thanks!
 
Rahul