When comparing KanbanFlow vs Priority Matrix, the Slant community recommends KanbanFlow for most people. In the question“What is the best task management software for small teams?” KanbanFlow is ranked 15th while Priority Matrix is ranked 22nd. The most important reason people chose KanbanFlow is:
The board space is very well used and configurable. User interactions are clear and intuitive.
Specs
Ranked in these QuestionsQuestion Ranking
Pros

Pro Simple & easy interface
The board space is very well used and configurable. User interactions are clear and intuitive.
Pro WIP Limits
Pro Swimlanes
Pro Pomodoro timer
Pro Estimation & time spent

Pro Collaboration features
Any changes you make on the board are instantly available to all members of the team.
Pro Helps prioritize, rather than simply listing tasks
Priority Matrix helps me focus on what's truly important on my todo list, so I can work more efficiently.
Pro Super easy to share / delegate tasks
All I have to do is press a button, rather than drafting a whole email to one of my co-workers.
Pro Solid methodology
The software implements time proven methodologies; not just a to-do list.
Pro Lots of different views
Priority Matrix makes it really easy to see your task list in different ways: You can see it in the quadrant view, calendar view, a filterable list, and also a Gantt Chart if you have the business license.
Full disclosure: Originally posted by an Appfluence Intern (who was equally impressed with the software's layout and functionality before working there)
Cons
Con You cannot do a search on all boards, so if you have a lot of info on many boards, you have to search one at a time

Con No mobile app
There is a web app for mobile devices but it lacks some features that a native app could offer.
Con Expensive
Used to be free, is now $12+ a month.
