Suppose we are in a backend admin website and we are in the page that show us the list of products. Now we want to insert a new one product. The insert/update form should appear:
A) in a modal window
B) or is better to redirect the user to a new page
In the solution A) the window will contain only the title ("Update product" or "Create new product") and the form. If the user change idea and don't want to modify/create the new item can simply close the modal window and return to the original window without the need of reload anything.
In the solution B) the page, in addiction to the form, will contain the website menu and the breadcrumb menu. All this elements are not related to the action "update/create product".
Wich solution is the better? The same solution will apply to the "Create new" and to the "Update"?