Choice of "
WCF Binding" is based on "
Transport Protocol" which you want to use for
communication between your WCF Service and Client Application.
This link has in depth information on "
WCF Bindings".
WCF Bindings
Your concern/intention seems to be with Availability of your Service for multiple incoming requests. WCF provides a very good feature for this, and it is - "
WCF Throttling".
This is one of the very good Article on "
WCF Throttling".
WCF Throttling