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NaBH4 is preferred over LiAlH4 in this reaction because NaBH4 is a milder reducing agent. It is less reactive and can be used in protic solvents like ethanol, whereas LiAlH4 is a much stronger reducing agent and reacts violently with protic solvents. NaBH4 is also safer to handle and less expensive. For a detailed explanation with online sources, refer to the following links:
[https://www.chemguide.co.uk/organicprops/reagents/sodiumtetrahydroborate.html](https://www.chemguide.co.uk/organicprops/reagents/sodiumtetrahydroborate.html)
[https://www.masterorganicchemistry.com/2012/09/10/nabh4-vs-lialh4/](https://www.masterorganicchemistry.com/2012/09/10/nabh4-vs-lialh4/)