If you’re developing custom logic in Microsoft Dynamics 365 CRM, you’ll often need to retrieve data programmatically—whether in plugins, workflows, custom APIs, or Power Apps integrations. Two primary methods exist for querying CRM data:

• QueryExpression (C# object-oriented approach)
• FetchXML (XML-based query language)

Both are powerful—but choosing the right one depends on your use case. We’ll compare QueryExpression vs FetchXML.