When comparing LINQ to SQL vs LLBLGen Pro, the Slant community recommends LINQ to SQL for most people. In the question“What are the best ORMs for C#?” LINQ to SQL is ranked 5th while LLBLGen Pro is ranked 10th.
Ranked in these QuestionsQuestion Ranking
Pros
Pro Free
Pro Async API
The runtime framework offers a full Async API for retrieval of data and object persistence, using .NET async/await statements to build truly asynchronous applications. Usable in Linq, QuerySpec and the Low-Level API.
Pro Multi framework support
Besides the LLBLGen Pro Runtime Framework, it supports Entity Framework Core / Full, NHibernate and Linq to Sql.
Pro Fast and powerful
After 10 years using it, you just work with your C# objects. Never had to go for work arounds. Never complained with performance (some thousand concurrent connections).
Pro Database first / Model first
Choice between Database first or Model first approach.
Cons
Con SQL Server oriented
To use other databases than Microsoft SQL Server, 3rd party software is needed.
Con Not free
No free plan available.