I would definitely recommend this over Trello. It has a smaller user base and therefore less support, but it is still worth the switch. While the free plan is amazing and I used it for over a year, the paid plan is even more awesome and is a very fair price for what it offers.
Built-in time tracking, Nice Kanban board with WAAAAAAY more features than Trello.
Not many that I can think of. The UI doesn't look the sexiest, but the usability is amazing which is ultimately what matters.
I've used KanbanFlow for two years (maybe more) to track personal tasks, work stuff, projects, and more. I highly recommend it!
Simple interface, easy to use, colorful, just enough features!
The recent redesign made it harder to use, in my opinion