Linq query or Lambda expression?

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Query Expression compiles into Method Expression (Lambda expression), so there shouldn’t be any difference, In your code though you are accessing First and FirstOrDefault which would behave differently.

See: Query Syntax and Method Syntax in LINQ (C#)

and LINQ Query Expressions (C# Programming Guide)

At compile time, query expressions are converted to Standard Query
Operator method calls according to the rules set forth in the C#
specification. Any query that can be expressed by using query syntax
can also be expressed by using method syntax. However, in most cases
query syntax is more readable and concise.

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