Hi - thanks very much for your comment. You ask a really good question. The fast.ai course is an excellent soup-to-nuts tour through deep learning and it gives you a lot of insight into how deep learning works. The Google ML certification is higher-level and it assumes that you have a decent grounding in machine learning theory as well as some experience in Google Cloud. So, based on the background you have, I would recommend the Google ML certification. You won't learn as much about deep learning, but you will get more practical skills. fast.ai is a great learning and prototyping platform but it's not used a whole lot in industry, so the skills you get from the ML certification will be more directly useful career-wise.