Typically speaking there is no such difference between National Institute of Technology Warangal and National Institute of Technology Surathkal as both of these are the top Engineering colleges of our country. Both of them offer the same quality of academics and exposure. So, in this case chose which is close to your house and add a fact that NIT Surathkal has a private beach.

You can also use our college predictor to see your chances in all the colleges:
https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer

Hope I have answered your question. All the best!