Does anyone know if there are data available (maybe in a past survey) that summarizes GIS use by industry?  I know that NH GRANIT conducted a survey 10 years ago about GIS use in the state, but that survey only asked if towns used GIS and how often.

Specifically, I'm interested to know GIS users who use proprietary software such as Esri products, those who use open software like QGIS, and those in between.  Industry information would be a bonus-- are you a government employee, non-profit, academic, etc.  

This stems from a discussion here on campus regarding students and their attractiveness to future employers based on the types of GIS they're familiar with.  We've heard extreme arguments on both sides regarding which GIS is "best".  It would be nice to be able to back those opinions with fact.

Thanks everyone