In which scenario is a 'Canvas app' preferred over a 'Model-driven app' in Dynamics 365?

A 'Canvas app' is preferred in scenarios requiring flexible layout design because it allows developers to position controls freely on a blank canvas. This flexibility enables the creation of highly customized user interfaces tailored specifically to user needs or design preferences. Developers can bring together various data sources, integrate media, and define the layout to enhance user experience without being constrained by a predefined data model or form structure.

The capability to drag and drop components and arrange them visually makes it easier to experiment with different designs and achieve a specific aesthetic or functional layout that aligns with user requirements or branding guidelines. This is especially valuable in situations where specific user interactions or visual hierarchy are critical to the application's purpose.

In contrast, model-driven apps are structured around a data model and are generated from components defined by the underlying data structure. They're ideal for scenarios that prioritize data-centric applications and standardized user experiences rather than customized layouts.