[Greg McKaskle]

The chances that nobody uses or knows LabVIEW at a competition are relatively slim. But learning more than one language is certainly a good idea.

My input would be to look over some of the LabVIEW examples and tutorials. Do the same of C++. Perhaps even write a bit of sample code that you think you'll do on your robot using joysticks or encoders or gyros in each.

Make an informed choice. There is no perfect language. There are tradeoffs with each, and learning how to learn languages and language features is one of the key aspects that will make you successful in computer science.