[timytamy]

1. Pretty much this.

   Originally Posted by MrRoboSteve

   The most important factor in selecting the language used by your team is the language your mentor knows.

   If you are a team that is picking a language out of the dark, then the biggest factor should be what is already known. The less time you have to spend on the basics, the better.
2. If all things in 1. are equal, you can look onto ease of use/complexity. Personally, I rate the ease of install and setup of Java highly, I prefer to spend time with students writing code, not installing toolchains. Others can speak on behalf of LabView's ease of use/complexity
3. Finally, if 1. and 2. haven't made the decision for you, you can think about where the students will go with their programing skills. Others have already spoken about Java being more CS and LabView being more engineery.