ScrumDesk vs. Trello
ScrumDesk more suitable for Scrum projects
See backlog item and subtasks at the same time
Multi-level hierarchy of requirements
Agile metrics like velocity, burn down or cumulative flow charts
Impediments and waiting flags
Agile business prioritization
Pre-designed quick filters to analyze team board to quickly find not updated tasks, tasks which will not be possible to finish till end of the sprint, etc.
Print physical cards from ScrumDesk
Non-scrum aspects of life covered by additional ScrumDesk modules. Root cause analysis, product roadmaps, product definition, value proposition, business models and personas.