How to choose the right quality track for your role.
Green Belt suits people who will run improvement projects part-time alongside their day job. Black Belt suits people whose day job is leading those projects, full-stop. Master Black Belt is for the people who teach Black Belts.
If you're funding a programme for a team, default to a Green Belt cohort and pick one or two for Black Belt later. Going Black Belt first almost always over-trains the population.