Technical University of Berlin

Hello, chances could have been better had your grades been more than 85% in B.Tech. You may still apply but I don't think we are in a position to tell if you will get admissions. Keep in mind the numerous applications to be received by the university alongside yours. You will be shortlisted if they find your application better than the rest. Take the GATE or GRE for maximizing the chances. Also look at other options too which could be lesser competitive than Germany.

I think, B.Tech from IITs is better because University of Berlin got 119 rank and IIT - Delhi has got 150 rank.
1. After completing B.Tech from Berlin, you will face problem related to placements because foreign universities don't allow you to sit in campus placement. If you want a job in Germany, you will have to apply for visa.
2. In IITs, there is no such problem. You will be able to sit for placement and get high package.
3. The process to apply for foreign universities is complicated it takes approximately 2 years.
4. But for IIT, you only have to qualify JEE Mains and Advanced exam.
You can go for Berlin to pursue Master's degree.

GRE boosts your application. You can check the university requirements.

TUB is one of the best university of Germany and World, so your UG marks should be at least over 75% with that you need to score minimum 6 band in IELTS or minimum 79 in TOEFL. Try to score high, it will help you to get admission there.
All the best.