One is not replaceable with the other. For typing out pure English text typing could be faster. However for writing equations even with the maddest LaTeX skills

One is not replaceable with the other. For typing out pure English text typing could be faster. However for writing equations even with the maddest LaTeX skills you are far behind from handwriting. Also it's quite impossible for me to replace pen and throwaway papers for thinking (I know, poor forests) with anything computer related. Even for consulting with my supervisor a blackboard and handwriting is essential.