Hi Himanshi!! Hope you are doing well!! For civil services and for being ias, ips,etc, you just need to focus on your upse exams and only in that basis you will be selected for civil services posts. You can do engineering in any branch whichever suits you, as it won't affect your upsc in any way. So take the branch which you think you can study with ease and which is good for you. According to me, ECE or civil branches include less study compared to other branches like computers or mechanical. But at the end it depends on you which is a better branch for you, so select and prepere for your UPSC.

Hope it helps.