Which is better, IIT Gandhinagar, IIT Patna, IIT Mandi, NIT Rourkela, NIT Warangal, or NIT Surathkal?

Firstly, the decision has to be yours based on your resources, performance, and goals. Try to take it as an exciting challenge to get through whichever college falls in your lot. As an IITian or NITian, you're given plenty of resources to begin a start-up and create your own jobs.

You may also see the following-

• As for CSE IIT Patna is the best of the lot; followed by IIT Mandi, NIT Surathkal, and NIT Warangal.
• Also, IIT Patna has qualified twice in a row for the coding Olympics known as ACM ICPC world finals. It's the only one of 2008 IITs to achieve this feat other than IIT Indore.
• IIT Patna also has a large number of GSoC, where even freshers are selected. IIT Mandi is also good as far as GSoCs are concerned.

Secondly, the coding culture at IIT Patna is greater than most IITs. It has the google powered DSC club too along with the Codechef Chapter which enhances the coding culture a lot and all branches have the provision of coding. 

As for extracurricular activities, all of the institutes excel in the provision of the same but IIT Patna also has a finance club, if you're interested in the field of finance.