I would recommend you AI instead of Cybersecurity because while learning AI you will gain the advantage to learn about Cybersecurity in detail but in case of Cybersecurity you will not get a good exposure towards AI.

Apart from this AI is an emerging field. To have a good academic and professional skill in the field will help you build a prosperous career.

**I would recommend you to conduct a research by yourself. If by reading the facts you agree with me then only take decision or else make the decision which you feel will be the best for your career.

I hope my answer helps. All the very best for your future endeavors!