Question

Master in IT,CS or Information security which is the best???

Answer 1

I cannot imagine a lack of work for good security people any time this century.

Answer 2

the one you want to do is the best.

Answer 3

All three degrees have a wide range of jobs associated with them. All three have long term lifespans. It would be better to find which jobs interest you the most, and then get the degree that prepares you the best for it.