Kanban tool comparisons tend to focus on feature lists, board customization options, integration ecosystems. These are real considerations, but they're not the first question worth asking, and getting the first question wrong makes the feature comparison largely irrelevant.
The first question: does the tool represent how work actually flows, or how you wish it flowed?
A Kanban board's entire value depends on it accurately reflecting the real workflow: the actual states work passes through, the actual points where it gets stuck, the actual handoffs between people or teams. A tool with beautiful customization options, configured to show an idealized version of the workflow rather than the messy real one, produces a board that looks organized while hiding exactly the information Kanban is supposed to surface.
This is a configuration and discipline problem more than a tool-selection problem, which is worth knowing before assuming a different tool will fix it. Most mainstream Kanban tools (physical boards, Trello, Jira, Azure DevOps, Miro) are flexible enough to represent an honest workflow if the team is disciplined about keeping the configuration honest. None of them enforce that discipline automatically.
What actually differentiates tools, once the basics are covered
Visibility of WIP limits and blockages. Some tools make Work-in-Progress limit violations and blocked items visually obvious at a glance; others bury this information in a status field that requires clicking into each card. For a practice built around making bottlenecks visible, this difference matters more than most feature comparisons acknowledge.
Flow metrics, if the team actually intends to use them. Cycle time distributions, cumulative flow diagrams, and throughput tracking are genuinely useful for teams that want to manage by data rather than by feel, but only if someone will actually look at these metrics regularly. A tool with sophisticated analytics that nobody reviews is paying for complexity without capturing the value.
Fit with existing tooling. A Kanban tool that requires the team to maintain two sources of truth (the "real" work tracked in one system, and a separate Kanban board maintained in parallel for visualization) tends to decay quickly, because keeping two systems in sync is friction that gets deprioritized under pressure. Integration with wherever work is already tracked matters more than any individual Kanban-specific feature.
Physical versus digital, for co-located teams. For teams working in the same space, a physical board retains real advantages: constant visibility without opening an app, and the small tactile satisfaction of moving a card that some teams find genuinely motivating. The trade-off is losing searchability, history, and remote accessibility. That's worth weighing honestly rather than assuming digital is automatically better.
The actual recommendation
Pick a tool flexible enough to represent an honest workflow, that integrates with wherever the team's work already lives, and that makes WIP and blockages visible without extra clicks, and then invest the real effort in configuring it honestly and keeping the configuration current, rather than expecting tool selection alone to produce the discipline Kanban actually requires.