Personal nice. Professional better.

In small talk situations Americans seldom jump directly into the business subject matter. For Americans business is always to certain degree a personal matter. In fact, Americans prefer to work with people they like, and who like them.

Germans, on the other hand, can and will do business with you even if you have little or no personal relationship. Most importantly, they want to know if you are good at what you do. Personal is nice. Professional is better.