What is the most sought after Agile certification?

The most sought after Agile certification is probably one of the Scrum Master certification - either Professional Scrum Master (PSM) or Certified Scrum Master (CSM). After Scrum Master, the next most sought after Agile certification is likely to be Scrum Product Owner certification - either Professional Scrum Product Owner (PSPO) or Certified Scrum Product Owner (CSPO).