We stick to Trello because everyone in the company outside of Engineering team can also use it (nice & simple interface).
But I prefer to cut down the amount of human action any process. So I miss the JIRA-GitHub integration when using Trello. I could just mention the JIRA ticket ID in a PR and the ticket gets closed when the PR is merged. Such sweet integration.
I was looking forward to GitHub Projects when I heard about it since everyone in the company has a GitHub account. When I tried GitHub Projects, it felt so inverse to what I expected. I expected a GitHub Project to have many repositories instead of the current way (each project has many repositories). I'm hoping they change it.