I used Wekan a while ago when I wanted to try a kanban board for organizing my personal tasks at work. Trello was out of question since it stores the data externally.
I found the UX on Wekan and Trello were hard to compare, Trello being polished and hassle free while Wekan still felt like work in progress and many things were straight out broken.
This was like a year ago, though, so maybe it has improved since.
On PC, it worked perfectly. On smartphone (Android), it works really bad. That's the reason why I (sadly) had to leave Wekan behind, it just didn't fit my use case because of this.
I found the UX on Wekan and Trello were hard to compare, Trello being polished and hassle free while Wekan still felt like work in progress and many things were straight out broken.
This was like a year ago, though, so maybe it has improved since.