Scrum or Kanban?

Both are totally different things. Kanban is oriented to flow. Scrum is oriented to batch or iterations. In Scrum after each iteration the team has to deliver something working (no matter you use it for software or non-software products). This is not needed in Kanban. At the end, the first thing to do is, to put this in terms of the PMI, perform the needs assessment activity which belongs to business analysis theory to define the solution after understanding the current situation and the future situation, where solution is equal to "the thing" to be created plus "the way" to create it.

Scrum focuses mainly on iterations and activities. It's best for feature-driven projects that need to go forward and be delivered quickly.

Kanban is best for ongoing projects, such as services. It is better for projects that have no significant feature backlog.

Also, exists a combination of both, called Scrumban.

Thank you Sergio.