Obviously Michelle had her share of simplistic programs - her choreo and complexity went downhill after Ariadne and basically deserted her after Schez. But her programs just have so much staying power. I still remember her exuberant spread eagle at the end of Rondo, the death drop to the solo piano run in her Rach short, even the semi-spastic footwork at the end of Aranjuez and Tosca...not only did she have incredible longevity in terms competitiveness, but she also skated with heart time and time again.
Yu-Na is certainly the more capable skater in almost every aspect of technique and she brought exactly what she needed to win her titles. But a skater who skated for the love of skating and for the love of performing would not have let the title slip away like the way she did at 2011 Worlds. And I think that's what makes me lean toward Michelle...at least for now.