Proxy receiver channel with HTTP destination or URL address?

Hi Experts,

     I have a scenario as below:

     (Webservice Client)SOAP --> PI --> PROXY(SAP ECC).

     A webservice client calls PI using SOAP. PI then sends the request to SAP ECC using PROXY.

    I am using AAE. Therefore I have ICO.

    In the receiver PROXY channel I have given:

   ADAPTER TYPE: SOAP

   Transport Protocol: HTTP

   Message Protocol: XI3.0.

   Under connection parameters:

   Addressing Type dropdown as 2 entries HTTP destination and URL address.

   In what cases i should use HTTP destination and URL address respectively?

   Which option is preferred?

   Do they work same or differently? How?   

   When I select HTTP destination where should I create the corresponding RFC destination? In PI ABAP stack using SM59 or PI NWA?

   If this HTTP destination is created in PI ABAP stack using SM59 then what type it should be? H? or G? 

Thanks

Gopal