Between these two options only difference is of one subject that is Computer Science and Economics. Now you have to do some introspection in the matter as which subject is of more liking to you. Why I am asking to do it because it is often seen that people having interest and liking in a particular stream or topic generally score good in that. When you have interest and passion in some work then you not only enjoy it but also gain strength and competency in that which is required for future career mapping in that particular area.
Anyway, let us go through the relative merits of these two areas defined by Computer Science and Economics. As regards the computer science area, this is definitely a niche area in today's situation and there are a lot of future scope and possibilities in it. We are now moving to an age of digital marketing, automation, artificial intelligence, and robotics and computer coding and applications have a great role to play there. The students who have good proficiency in this area are definitely going to carve out a good career. After doing your Intermediate you can go for B.Sc. or B.E. /B.Tech. in computer engineering and then select the specialisation in any area like coding or hardware maintenance or software development or networking or cloud technologies etc as the options are varied. The area of computers is a fascinating area and attracts many people to it.
Let us now see the other subject that is Economics. This is a subject for those who have interest in financial side and after learning the basic economics one can then settle for a MBA in finance or something of similar nature. There are many other offshoots where one can try in these field like auditing, insurance, risk management etc. As I said earlier, I would reiterate that interest in that particular niche is what that finally matters in one's life.
Apart from these two subjects you have also got three subjects in your kitty that is Physics, Chemistry, and Mathematics. There are immense opportunities in these conventional subjects and studying them in your UG and PG can lead you to research in these basic sciences. If you have interest like that then the fourth subject becomes secondary and you can give more thrust in one of these three subjects which you might think become a core strength in your future. This line of approach will also give you opportunity to apply for teaching positions in colleges, institutes, and universities.
One last point that comes to my mind is the attempting for the administrative and other services in our country through competitive exams and if that is your cup of tea then it makes sense to do a general study of all the subjects whatever you choose keeping in mind the overall objective of getting through the competitive exams where knowledge of all the areas is required rather than competency in a particular subject.
Please consider these points and match them with your interest before taking a calculated decision in the matter.
Knowledge is power.