In upcoming chapters, you will learn how to use LINQ to SQL and LINQ to Entities. You might wonder whether you need to learn both—and depending on your requirements, how to choose between them. In fact, you should study both before making a decision. To help you decide, this chapter provides solid comparisons and other information for you to consider. The chapter includes a “big picture” overview and guidelines that can help you choose, which might at least influence which technology you would want to learn first. This chapter does not mention features that are equivalent in both LINQ to SQL and LINQ to Entities because, of course, those have no influence on your choice.