Hi @PackElend
Although I haven’t spent much time to compare them, from my point of view and how it applies to my workflow, I can write:
Kanban plugin
I have dealt with some issues during my use, not always work as I expect may be the developer no longer maintains it, although I think someone has tried to improve or fixed it. Its strength is that it handles any note in Joplin as Kanban Cards.

YesYouKan plugin
Simpler, from this aspect expect less problem, the output is visually better. However, the Kanban card in fact is a title within the same note (although I can add a Note Markdown link below any title). Lastly, it has a very attractive plugin name.

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