The following table (thanks to Alin) was compiled to get an fast overview on the 3 mostly used agile approaches – Scrum, Kanban and the combination of both Scrumban.

Maybe you’re currently thinking about your environment and what agile method to use. Use this list to support your decision. 

Scrum Kanban Scrumban
Board/Artifacts simple board
product backlog
sprint backlog
product increment
burndown chart
board mapped on the process board mapped on the process
Ceremonies daily Scrum
sprint planning
sprint review
sprint retrospective
none required daily Scrum
other Scrum related ceremonies if needed
Prioritization Part of backlog grooming. Done by PO Out of the process. There should be a prioritized backlog. Out of the process. There should be a prioritized backlog.
Who feeds the work in progress (“brings new work”) PO Depends on defined roles and necessities Depends on defined roles and necessities
Iterations yes (sprints) no (continuous flow) not mandatory (continuous flow); could have sprints
Estimations yes (in ideal days or story points) no (similar work size items) (a) no (similar work size items) (a)
Teams recommended cross functional cross functional or specialized cross functional or specialized
Roles Product Owner
Scrum Master
Team
as needed Team + as needed
Teamwork collaborative based on pull approach based on pull approach
WIP planned for the duration of the sprint controlled by workflow state controlled by workflow state
changes to work scope should wait for next sprint added as needed (JIT) added as needed (JIT)
Product backlog prioritized list of user stories (estimated) no (JIT) no (JIT)
Impediments addressed immediately addressed immediately (b) addressed immediately (b)
When does it fit? Product development
Small value adding increments development possible
Requirements are in good shape
Support/maintenance work (operational level) Product development (unclear vision)
Evolving requirements (no clear roadmap)
Need to include support/maintenance (event driven) work in the process

(a) team needs to comment on non-fitting work items in order to ensure readiness
(b) “stop the line” approach; teams should swarm to solve the impediment

Update 2015-03-12 – Scrum and ScrumBan as it’s next evolutionary step … and is it wort starting Scrum at all