Another argument: the number of toolkits for LabVIEW.
Have you seen any other programming language with so many add-on tools (Signal processing, Filter design, Vibration analysis, Modulation, Visual analysis, ...)?
And a last one: the number of NI alliance members.
In any domain of application, you will be able to find NI alliance members. They can help you to solve problems that otherwise would take you too much time, and they can provide support if it is not available from within your organisation.
Good luck,
Adriaan.