Choose BITS Hyderabad over NIT Raipur or NIT Puducherry. Here are some of the reasons for choosing this institute:

• They offer a beautiful campus with an enthusiastic student crowd.
• BITS Hyderabad has updated modern machinery and lab facilities.
• The placements definitely differ between the BITS and NITs.
• NIT Raipur is very old-fashioned in its approach towards studying and learning.
• Their faculties teaching method is old and prefers their students mugging up notes rather than learning and understanding something.
• BITS, unlike NIT Raipur, their teaching method is industry-oriented.

You might think that going for a dual degree is better as IT companies only prefer CSE graduates. But nowadays this notion has changed as with big data and analytics creating a boom, more and more such companies visiting campuses and hiring people from all branches.

Therefore it is suggested that you go for BITS Hyderabad, where you will grow and learn in a much more competitive environment. Your vision will be broadened.

The answer to this question depends on your personal preferences and expectations from your college-to-be.

If you prioritize infrastructure, NIT Srinagar has one of the most beautiful campuses among all the NITs. On the other hand, NIT Puducherry has a better faculty than all your other options. 

Placement-wise, NIT Raipur has the best record among these colleges. However, the infrastructure and faculty of NIT Raipur are below average. But it is a good college for its sports facilities and senior-junior connections. There aren't any cases of ragging on its campus. Also, it offers better connectivity than the other NITs you’ve mentioned. 

As for the northeastern NITs that you have mentioned, most people don’t choose them. This is because of lesser connectivity and a lack of overall facilities at them. Their placements aren’t at par with the other NITs. Also, you’ll experience totally different weather and culture over there. So you might face difficulties in adjusting. 

Now the choice will also depend upon the branch you are offered at NIT Raipur, NIT Srinagar, and NIT Puducherry. If say, you are offered Biotech or Biomed at NIT Raipur and Civil at NIT Srinagar, without a doubt, go for the second option. Biotech and Biomed at NIT Raipur aren’t good choices.

NIT Puducherry is very new compared to College of Engineering Guindy (CEG). Let me share some points which might help you decide.

• CEG is very old and experienced as an educational institution. It has well-established CSE and ECE departments with exceptional and updated lab facilities.
• The syllabus is more or less similar in both colleges.
• CEG has a more competitive student crowd which eventually helps students to boost their morale. 
• Due to its years of educational experience, CEG definitely has a better placement record than NIT Puducherry.

It is recommended that you go for CEG if you have to choose between these two. But if your choice only is NIT Puducherry then you can opt for it. It is a good college but as it started functioning recently, it is better to go for an experienced one.

Since you did not specify the criteria, I will be comparing the aforementioned institutes on the basis of 2 main criteria placements and campus life. 

• In terms of placements, the preference order should be NIT Patna > NIT Puducherry > NIT AP. 

NIT Patna has a well-maintained campus and enjoys a good reputation being one of the oldest engineering colleges in India. However, the academic rigor is poor and the professors aren't interested in teaching. Moreover, it suffers a lot because of its location in Bihar one of the most underdeveloped cities in India. 

• In terms of campus life and location, NIT Puducherry > NIT Patna> NIT AP. 

NIT Puducherry has the best location among these institutes. It is located near the sea beach and students get to enjoy the picturesque view of The Bay of Bengal.

NIT Andhra Pradesh should be your last priority because it has many major cons like lack of campus, ragging, and poor placement scenario.

According to my friends at IIIT Guwahati, CSE at IIIT Guwahati is definitely a better choice. Let me provide some points which will give you a better insight into the colleges.

• The campus of NIT Puducherry is almost 130 km away from the city, located in a remote place known as Karaikal. This hampers placements.
• In NIT Puducherry, 90-95% of students are from South India. So, students from other parts of the country face a serious linguistic problem.
• For most North Indian Students, it is somewhat hard to sustain in the South Indian culture.
• IIIT Guwahati has experienced rapid growth over the last few years, which makes it a much better choice than NIT Patna/ Puducherry.
• There is no home state quota in IIIT Guwahati, so there is no such problem of linguistics as in NITs.
• In addition, there are 18 students in IIIT Guwahati who are from abroad, selected through the DASA UG scheme of 18 seats.
• From 2019, the B.Tech seats were increased by 33% for Girl Supernumerary Quota, because the previous batch had only 3.5% girls. The total number of seats from then is 233.

Therefore, IIIT Guwahati has a lot of advantages over NIT Patna/ Puducherry, which makes it a better choice for students in engineering.