Use webservicequery or httppost or another way in expressions?

We extensively use the process model based smartservice node 'Send Http Request', which I think is part of a plugin.  We would like to start calling some of our internal webservices inside of expressions/SAIL code (and not in a process model).   A coworker has been using the httppost() function available in the webservice plugin.  I tried to implement the native webservicequery() function without much luck.

What is the preferred method for calling webservices via expressions/rules/SAIL?

There appears to be a few different plugins and internal functions for calling webservices, but not a clear indication of why someone should use one over another.

What about the preferred smart service node in a process?  (a coworker has recently been writing her own Java based plugin also)

 

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