Home country is typically known as the country in which someone was born and/or raised in. On the other hand, a foreign country is a country in which it is not the one someone lives in or is familiar with. A comparison of a home country and a foreign country could be that a person who was born in Germany, but either moved away to Canada or stayed in Germany. Either way, if they moved or not, Germany is their home country because it was where they were born. If they moved to Canada from Germany, all other countries would be foreign countries because they are not familiar with them, unless for example they traveled to Mexico frequently (almost considered a second place of residence), giving them a lot of information about the country. If they stayed in Germany, all other countries would be foreign countries, unless again they traveled to another country frequently, like Mexico, enough to learn a lot about the country. Home country and foreign country are different because most of the time, a person knows their home country much better than a foreign country, unless their home country was just where they were born, but not raised. Personally, I do not think one term should be used more than the other because the terms have quite different meanings. In specific situations, I think they could be used interchangeably, but in most situations they are not.
