Data Import Wizard vs. Data Loader: Which Tool Should You Choose?

The choice between the Salesforce Data Import Wizard and Data Loader depends entirely on your dataset size, the specific object you are updating, and whether you need to automate or delete data.

Choose the Data Import Wizard for small, simple imports under 50,000 records that require built-in duplicate checking. Choose the Data Loader if you are handling large bulk migrations (up to 5 million records), require complex automated scheduling, or need to export or delete records. Summary Comparison Table

The core operational and technical differences between the two native tools include: Salesforce Data Import Wizard VS Data Loader – Skyvia Blog