When I interviewed there was zero preference due to being prior military it was strictly meeting the mins they were looking for.
When it did come into play they asked me what was the most difficult training I had ever been to and I asked them if they wanted the list chronological or alphabetical. They did not ask any questions after that.
in my experience it was a benefit once I was in the door but that is only one airline and I am sure there would be less preference at the legacies.