I believe this all depends on the situation, but I'm leaning towards
"To bring about an emotional response as a rhetorical strategy as the best means for conveying critical information." (Or the 2nd one)
Ethos provides proof of something using ethics or credibility. Ex: "This face wash is dermatologist recommended."
Pathos is trying to persuade you by sending you down an emotional or sad path. Ex- Animal abuse commercial trying to get you to donate.
Logos is using facts and usually statistics to prove a point. Ex- "About 480,000 deaths are caused every year in the U.S. due to the high amounts of cigarette smoking."
