hi,

see mechanical engineering and artificial intelligence and data science is quite different stream and less of connection or similarity between them. now as per job growths and employment opportunity after bachelor of technology course, both of the course has wide job scope both in India and abroad. but you  must have the excellent knowledge of the discipline to get a decent salary job.

so it should have to be your choice. if you are good at physics and mathematics, interest about topics like work power energy, gravitation, motions etc you should go for mechanical engineering. if you have interest for mathematics, calculus, limits, functions, set theory etc you may chose AI and data science.