Explanation
Interactive Email Form block is the content block that the team should use to capture information directly from the inbox for some subscribers. Interactive Email Form block allows marketers to create forms within emails that can be filled out and submitted by subscribers without leaving their email clients. The form data can then be stored in a data extension for future use. Smart Capture block is used to create forms within landing pages, not within emails. Einstein Content block is used to display personalized content based on subscriber behavior and preferences, not to capture information from subscribers.