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It all depends on your interest. Both are good courses. Here I am mentioning career prospects of both.
Career prospects in MA Eco:
The study of economics provides a good opportunity to gain an edge in today rapidly globalizing world. Well-trained economists are in huge demand across industries, not only at the national but at the international level as well. In recent years, there has been a sudden spun in the demand for economic analysts, researchers and consultants. It is precisely against this backdrop that the study of economics opens up the doors of a wide variety of the most sought-after career options. I have mentioned all the available options that I could think of
1) Every corporation, financial service provider, financial institution, consultancy firm and the public, as well as the government sector bank, have positions for economists, research associates, research analysts, risk managers, debt managers, budget managers, investment analysts, economic advisory, econometrician, etc.
2) There is a good scope of teaching in schools, colleges and the universities. However, in order to teach in a university and M.Phil and/or a Ph.D is mandatory after clearing theJRF NETexamination.
3) You have an option of writing the Indian Economic or Statistical Service Examination conducted by the Union Public Service Examination get into higher posts available in the government sector. Those who qualify this exam can get into the central government services which manage economic planning and analysis.
4) Various government organisations offering opportunities to economics postgraduates (graduates too in some cases depending upon the eligibility for the applied post) are:
Planning Commission, RBI, National Council for Applied Economic Research, National Institute of Public Finance and Policy, also international organisations such as the World Bank, Asian Development Bank and the International Monetary Fund.
Career prospects in LLB:
Lawyers can find employment in both public and private sector organizations. Central and state government jobs are also available for lawyers. Lawyers can also work as legal advisory and legal counsellor for firms, organizations and families. The LLB graduates can work in:
Legal Cells of Private and Public Sector Companies
State Bar Councils
Consulting FirmsIndian and Foreign Law Firms
Legal Department of Foreign Companies
Multi-National Companies
Global Audit and Compliance Firms.

When we think about a career in agriculture, we imagine a farmer working in the field, or riding a tractor. In today age of technology, it's not always like that. Agriculture is a big industry, and most of the careers are related to Science and/or business. The agriculture industry plays a major role in the Indian economy by contributing approximately 15-20% of the GDP (Sources: IBEF & WebIndia123). Hence, if you have the passion, skills and knowledge, there are several opportunities. The study of agriculture is called agricultural science or agricultural technology. The field combines the natural and social sciences, along with economics, engineering and management (particularly natural resources management and business management) of biological systems to practice, development and understands the fields of agriculture and forestry. Being related to the field of life & biological sciences, agricultural science is multidisciplinary and inter-related to food science & technology. Agricultural science uses the fundamentals of biology, chemistry, physics, mathematics and statistics to solve the problems of agriculture-food industry. But, students also need to study economics and business management at the undergraduate level. With a degree in agricultural science, you can have careers in the agricultural sector. Major domains within the agricultural sector include agribusiness, R&D organizations, public and private agencies, government and policy-making agencies, and private consulting companies. Agricultural Science involves research and development on production, processing, the productivity of crops and end products for consumers. Agricultural Science professionals play a vital role towards maintaining food supply of the society. Major activities include improving the quality and quantity of farming, improving crop yield, minimizing labour, conservation of soil and water, and pest control.

Originally Answered:
Which branch should I choose: ECE or CS?
It actually depends, how you like your future to be.
Choosing CSE will lead you towards software companies which will definitely provide you with a better pay package than a core ECE company will provide to an average student. To be precise, you may get a private job with a high salary structure. On the other hand, ECE, being a core branch, there is a good scope for government jobs too. For example, you can appear for competitive examinations such as IES with ECE as your subject and the best part is, you can still apply for software jobs if you are confident of your coding skills.
All the very best.
Cheers!