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Mayank, as told by other Experts there are several streams you can persue after XIIth. It is not mentioned in your question as to what subjects you have chosen for yourXIth and XII th. One of the options would be to persue the same field and do graduation in one of them. Other option is to first think that what kind of work you will find easy to do in your career, or what kind of work you wish to do to make living. Think on the vorad lines first i.e would you be good at Marketing kind of jobs, or technically oriented shop floor jobs, or in managing in corporate sector or in managing personnel (human resources) or say you want to proceed in media related jobs or want to start a business. List these out based on your priority and then think further on the top 3 choices. You will yourself get an answer of your choice in which you can actually suceed in lesser time.

CS and ECE are two domains playing a crucial role the present digital world. ECE deals with electronics, some of electrical subjects and communication subjects. Colleges provide some of the computer courses in ECE like C, DSA, CO, OS, SE, DBMS etc. It is similar with CS domain also you can find some of the ECE subjects in addition with CS subjects in under graduation program. But if we look according to placement category, students from CS domain will get placed faster because of their knowledge in software sector. Since ECE students will also have good knowledge in their sector as well as some basic knowledge in software field but not as depth as CS students learn. This makes the difference.
Since both engineering branches have their own importance, CS is the best domain for a student who are interested to learn about computers and networking. However, the future will be totally digital world and software plays a crucial role,that is why CS is best.