Ultimately it's your decision, and you could opt for both. If it was me, I'd consider which one my employer would value most highly, and which one would help me in my future career (will you always stay in Agile teams or would you consider a future job move to a non-Agile environment?). Looking at what your colleagues have would be another indicator of what would be the most valuable.
Or you could go for which exam you think you will be the easiest!