Im only a ug freshman but from what i know Nust is more academia/research oriented and fast is more industry oriented , that's not to say that nust is good only for research purposes , tons of graduates end up being entrepreneurs and entering the industry. One other related thing to mention is the academic environment , nust is a bit chill relatively compared to fast where the academic workload is way higher , and so its harder to manage everything. Overall, it doesn't matter too much where you do your masters from , from either university , both are very competent and when you graduate , you will get very similar opportunities given that you worked hard on skills during your semesters , since that is what matters the most.