Qualitative vs. Quantitative.
Quantitative assessment from afar, in their often high office towers, on stocks will not work in all markets. In Thailand for example, its much more important to have a qualitative assessment/view/understanding. As there are many "wall flowers" here and other type of listed stocks which look good "on paper", but which long on-location experts would never invest in. Sometimes, some stocks look cheap for a good reason. Exactly the reason a rational investor may want to avoid them. Qualitative vs. Quantitative can make all the difference.