When comparing Asana vs WhatsApp, the Slant community recommends Asana for most people. In the question“What is the best team chat software?” Asana is ranked 29th while WhatsApp is ranked 53rd. The most important reason people chose Asana is:
Asana has fantastic mechanisms for dealing with team collaboration. Not only can tasks be assigned to team members, but Asana lets users follow tasks and use hyperlinks to refer to team members within a task.
Specs
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Pros
Pro Powerful team collaboration features
Asana has fantastic mechanisms for dealing with team collaboration. Not only can tasks be assigned to team members, but Asana lets users follow tasks and use hyperlinks to refer to team members within a task.
Pro Free for up to 15 users
Pro Simple workflow
The Asana task workflow within a project is broken down into "Today," "Upcoming," and "Later." The tasks themselves have the status of either done or not done. There is also a subtask feature to group tasks together. Tasks can be assigned to other team members and are stored in the "Inbox" view for processing. This replaces email for some team communication.
Pro CSV export and print
Pro Very polished interface
Teams can have private (only visible to project members) and public (visible to anyone in the team) projects. Each member can also have their own personal projects.
Tasks can be viewed in list and calendar views. It's possible to display only the tasks assigned to the user or tasks organized by project or team. Single tasks can exist in multiple projects. Lists of tasks can be divided into sections and organized in many different ways – tasks that still have to be done, tasks that have been completed, by due date, by assignee, by popularity, etc.
Expanding a task will allow adding things like subtasks, tags, and attachments, as well as comments. Users can also subscribe to a task via RSS from this view. There's a separate view specifically for attachments.
Search lets you find what you’re looking for quickly.
Pro Tagging system allows easily filtering tasks
The tagging system enables project managers to easily filter tasks.
Pro Provides lots of help for getting started
There are many videos, tutorials, and reference documents to help you get up and running.
Pro Supports Kanban and list views
Asana provides a list view and a Kanban view which can be selected if a new project is created.
Pro Well thought out keyboard shortcuts
Keyboard shortcuts all involve the Tab key, so it is unlikely that they will interfere with shortcuts that have already been established.
Pro Integrates with Slack
It's possible to have tasks appear in a Slack channel.
Pro Straightforward interface
The interface is very simple, fast and easy to use. You can start using it as soon as the app has been downloaded - it does not require setting anything up or registering. You can communicate with anyone in your contacts list that also uses WhatsApp. Includes useful features like seeing when a contact is currently available or typing.
Pro Widely used
WhatsApp reported 1.5 billion users in 2018. Your friends are most likely already using WhatsApp, so it's easy to get setup.
Pro Effortlessly builds your contacts by using your phone number as identification
WhatsApp will automatically find all of your contacts currently using Whatsapp and add them to your contacts. This makes it really easy to setup and given that it's the most popular messaging app it's likely that a lot of your contacts are already using it.
Pro Message mirroring on web app
WhatsApp can be used from the desktop via Chrome, Firefox and Opera browsers. Accessing it requires using the Android app to scan the QR code that's presented on web.whatsapp.com.
Pro Signal protocol
Whatsapp uses the state-of-the-art Signal protocol that ensure strong end-to-end encryption.
Pro One-on-one texts can be encrypted
WhatsApp has implemented end to end encryption for messages sent on it's service. Even WhatsApp has no way to read a users messages.
Cons
Con Mobile version lacks calendar
Asana's calendar is present in the web version but is conspicuously missing in the mobile app.
Con Unable to manage multiple workspaces
Each "workspace" or "team" in Asana is strictly isolated. You cannot see your personal tasks versus work tasks or collaborations together, you need to log in to a different profile.
Con No task dependencies in free version
Dependencies is only available only to Teams and Organizations on Asana Premium.
Con Can not use list view and board view for a same project
Asana can only choose one, either a list view or a board view.
Con Strange UX with strange workflow
Similar to task the manager in Todoist or Wunderlist, but not too complex for under four members.
Con UX Design is overly opinionated
The workflow is not very customizable, which forces you to use a flow that may not be your preferred or best option.
Con Shares meta data with Facebook
WhatsApp shares your messaging meta data with Facebook if you do not opt-out in the settings. If you use the same phone number for WhatsApp and Facebook, the profiles can easily be linked.
See https://www.whatsapp.com/faq/en/general/26000016
Con Tied to carrier phone number
WhatsApp cannot be used by people without a smart phone with an active cell plan. If your phone is lost or damaged, or if your phone number changes, you cannot get messages sent by friends without them updating your phone number. You cannot send message to them until you are able to get SMS messages at your phone number.

Con Proprietary
Not open source.
Con Hard to migrate history cross platform
Migrating your chat history from Android to iOS or the other way around is not so simple. In some cases it requires a 3rd party app and in some the only way is to migrate specific chats one by one.
Con Web interface uses message mirroring
To use your computer to send messages your phone must be on with a consistent data connection.
Con Single device
You cannot use the same WhatsApp account on multiple devices (e.g. a tablet, a PC and a cellphone). The account is tied to the device with the specific cellphone number. Chat history is deleted when you sign in to a new account, unless you have created a backup.
Con No cloud sync
Messages are not stored on WhatsApp server for privacy and security reasons.
Con Limitation on shareable file sizes
WhatsApp now allows users to share files of any type, but there is still a 16 MB size limit.
