
Explanation:
You should use canvas apps for highly customizable layouts. Canvas apps provide full control over user interface and how screens can interact with each other.
You should use model-driven apps for implementing complex business logic. Model-driven apps take care of the user interface part, so you only need to focus on business rules, forms, and views.
You should use Power Apps portals for a customer facing website. Power Apps portals allow you to create a customer engagement website using pre-built templates.