I always try to submit my changes to both. I would like OSM to be great but I find myself using Google Maps as well, it's good for me for both to be up to date.
Did you set up a follow up test to find out if this wasn't just a chance occurrence? For example, by introducing a feature that exists (some unmapped named side street), but subtly misspelled on purpose.
Since my only goal was to get friends to my house instead of some corn field a mile away I accomplished my goals. I can see how someone who makes a lot of contributions would want otherwise, but my goals are different.