Slenke vs. Asana

Asana is great for simple to do lists, but it will simply not cut it
when managing any more than just that.

Threaded Posts and Comments
Instant Messaging
Post Bookmarking
Task Lists
Task Boards
Task Calendar
Unlimeted Task Hierarchy
Unlimeted File Storage
End to End encryption on all messages and files
Time Tracking
Time Resource Management
Guest Users
Multi Level Permission System