The document outlines several key differences between LINQ and other data querying technologies: 1. LINQ queries are verified at compile time, unlike SQL which is only checked at runtime. LINQ also allows debugging under the .NET framework. 2. LINQ to SQL is best for rapid application development but only works with SQL Server, while Entity Framework supports multiple databases and complex types. 3. LINQ queries are type safe and can be debugged more easily than stored procedures, plus LINQ supports improvements like multithreading more readily.