What about getting specific about what skills/characteristics actually make a better pilot? Here's a few to start with (not in order of importance):
Reliability and timekeeping
Flight planning
Pre flight checking
Weather judgement
Personality and rapport with any pax
Personal presentation
Smoothness of flying
Navigation
Maintaining recommended FM procedures/profiles
Judgement of hazards eg weather, landing sites
Flexibility and accommodation of task changes
Handling problems/emergencies
Honesty - eg reporting exceedances, flight times
Maybe there are some trends of differences in these specific areas between Mil/Civil trained pilots?