is their a big diff. b\w doing b.tech from cs or it and doing b.c.a . is b.c.a valued quite less hen b.tech???

BCA is more into the application side as the name itself implies. Bachelors in Cimputer Application and B Tech/BE in Computer science is the engineering part which deals with the internal/technical aspects including hardware and the in and out about the computer coding. You can take it as an enginee

computer science is better choice than bca it implies more programmig techniques