I normally use either the Plug and Play or Plug and Play project style. Both are LabVIEW wrapper functions for the instrument calls and come with a DLL that does the translation into, for example, SCPI commands.
Plug and Play project style is organized more like classes with private and public functions.
I stay away from IVI because I always seem to need to use vendor specific calls that aren't part of the IVI spec, defeating the whole purpose of using IVI.
