Good questions! It is a crowded market, but nobody has really nailed it yet. Clubhouse is being built specifically for software teams, and we're trying to provide just enough structure to let you see what's going on at a high level, but keep it flexible enough so that you can work the way your team wants to.

Part of what makes us different is the little details that add up to a better UX, but our GitHub integration is pretty sophisticated: we don't just link stories to pull requests, we can actually automate your Clubhouse workflow using your existing GitHub workflow. We've also put a lot of work into cross-project visibility, so most other tools only let you see one project at a time, so it's difficult to know what a single person is doing across multiple projects, but in Clubhouse it's very easy. We're also starting to get into more interesting features, like providing data-driven guidance around milestones and deadlines, the ability to create roadmaps and more organic story dependencies, more analytics/dataviz... we still have a lot to do.