Hello,
Both the branches of Engineering are of 4 years undergraduate course.
ECE course deals with the investigation and study of design, installation, manufacture, and operation of electronic tools a, d equipment, telecommunication systems, systems and machinery, radio, computers, and TVs used in the computer industry, hospitals, entertainment media, defence forces and in numerous other areas.
Please visit this link for a list of Btech ECE colleges in India https://www.google.com/url?sa=t&source=web&rct=j&url=https://engineering.careers360.com/colleges/list-of-electronics-and-communication-engineering-colleges-in-india&ved=2ahUKEwi_jff9-LHrAhXoyzgGHa_QDBAQFjADegQICRAB&usg=AOvVaw0O_ZFpkeR19AUDwukP9P69

The course for B.tech Biotechnology covers almost all the fields of Biotechnology like Biological Chemistry, Microbiology, Molecular Biology, Analytical Techniques and Bioinformatics, among others.
Please visit this link for a list of Btech biotechnology engineering colleges in India https://www.google.com/url?sa=t&source=web&rct=j&url=https://university.careers360.com/colleges/list-of-biotechnology-universities-in-india&ved=2ahUKEwjc2Juj-bHrAhUiyzgGHT0ODWcQFjAJegQIAxAB&usg=AOvVaw3L_KxLGMTaBBpt1Y-j9nPb




Hope it helps

Greetings,
Firstly I will say that both the branches are awesome, you should choose in which you feel enthusiastic. Secondly, according to me biotechnology has good scope but in abroad not in India so if you want to work in India you should pursue for Electronics and communication engineering, that still does not mean it is better. So it will be kind to choose the path in which you feel interested.
Hope this will help.