Should I pursue BCA from Sikkim Manipal University or B.Tech from AMIE after doing my Diploma in electronics engineering?

AMIE doesn't offer B.Tech, first of all, and neither it is valid. It is not recognised by AICTE and is a complete waste. BCA from SMU is also a waste as SMU is not a very good distance course provider. I would suggest taking lateral entry into regular BCA or B.Tech. Instead of pursuing a distance co

B.Tech/BE through lateral entry (direct second year admission) will be best for you, you have to appear for state LEET examination to get a good college. Don't restrict yourself to AMIE, also search for other options.