Massachusetts Institute of Technology is not better than IIT Bombay but unique. I will tell you why it is considered unique when compared to IIT Bombay.
A few years ago there was a girl Malvika Raj Joshi, who was home-tutored by her mother and thus was rejected by IIT Bombay under the pretext that her schooling wasn’t sufficient for admission. The same girl was accepted into Massachusetts Institute of Technology. While other elite IITs rejected her because of a lack of proper school education, only Massachusetts recognized her amazing talents and decided to hone them.
She was granted admission to MIT based on her outstanding achievements at the International Olympiad of Informatics. MITs flexibility deserves applause for accepting such a student that has unique potential despite having no formal school education.
So in all these aspects, MIT is considered superior to even IIT Bombay as it gives chances to unique profile students.
Honestly speaking, none of the IITs are at the level of foreign universities today. IIT is an excellent choice only if your prospects involve settling in India. Globally, IITs lack the necessary worth when compared to top US, UK, French, and Swiss universities.
In case you want to settle abroad then the kind of universities that will help you do so are MIT, Harvard, Yale, Oxford, Cambridge, and the Sorbonne only. Sadly, IIT is still not credible enough to help you settle abroad.
There are other reasons as well why IITs are considered inferior to top foreign universities like Oxford. At Oxford, you will find such a diverse peer group of geniuses that the learning experience will become excellent. There are many who study unique subjects like History, Latin, Greek, Modern Languages, English, Engineering, etc. When you end up befriending such geniuses, it adds to the overall experience. You basically get to spend a lot of time with intelligent people with unique interests and this helps you develop holistically.
This diversity is definitely lacking on the part of IITs and they have a long way to go.