Which is better: Electronics and Instrumentation in BITS Pilani or Computer Science in BITS Goa or Hyderabad? Why?

The decision should be completely based on your interests. It is always better to choose a course that has ample opportunities; otherwise, you will end up jobless. You have to maintain a good CGPA to get a placement here since the competition level is very high. BITS Pilani is comparatively better at academics and placement support than BITS, Goa, or Hyderabad.

When it comes to the selection of the course, Electronics and Instrumentation are a bit difficult for scoring a good CGPA. After this course, you are open to both CSE and EEE fields for your higher studies (based on the electives you have selected).

CSE is comparatively better, which opens up  high opportunities and BITS across India provides placement support for students with good CGPA

So, choose wisely based on your interests.