Answer:
Image result for Angular when to use reactiveformsmodule.
In summaries, if forms are very important for your app, or reactive pattern are used in your app, you should use reactive forms. Otherwise your app have basic and simple requirement for forms such as sign in, you should use template-driven forms
Explanation:
Each form has a state that can be updated by many different interactions and its up to the application developer to manage that state and prevent it from getting corrupted. This can get hard to do for very large forms and can introduce a category of potential bugs
