Comparison between Workflow, Process Flow, Visual flow

Feature	Workflow	Process Flow	Visual Flow / Visual Workflow
Description	Workflow allow users to set up criteria and actions	Process Flow automates your business processes by providing a powerful and user-friendly graphical representation of your process as you build it.	Visual Workflow enables you to create flows, which are triggered by users rather than events
UI	Runs in Background and take the action for ex field update	Runs in Background take the action for ex. Post chatter feed	Allows user to interact from UI and take input from user.
Initiated By	Triggered by events. For ex. Record save	Triggered by events. For ex. Record save	Triggered by users rather than events. For ex. Survey button click on lead object.
Supported Actions	·   Create a task ·   Create an email alert ·   Field Update New ·   Outbound Message ·   New Flow Trigger	·   Create a record ·   Update fields on any related record—not just the record or its parent. ·   Launch a flow—as an immediate or a scheduled action. ·   Send an email ·   Post to Chatter ·   Submit for approval ·   Call apex methods ·   The process builder doesn’t support outbound message	·   Lookup any object ·   Create Flow variables ·   Do CURD on any object
Scope	Limited to object in context and its master	Process Flow is not tied to any object	Visual Flow is not tied to any object
Interface	Point and click, multi-screen	Drag drop, Single Screen, easy to change & visualize	Drag drop, Single Screen, easy to change & visualize
Scheduling	Immediate and scheduled actions	Immediate and scheduled actions	Only Immediate actions
Use case	Send a web service callout to Inventory management system to update stock when  opportunity close successfully	Send a chatter feed to group of users when high value opportunity stage is changes	Wizard for self-help portal if it does not resolve issue then log a case with all the details.