What should I go for, IT in NIT Surathkal or CS in NIT Allahabad? I want to go for Surathkal but don't know if IT is a good option.

One of my friends was doubtful whether the hindi-speaking culture of MNNIT will have any impact on her English communication skills. If you are doubtful regarding the same, I would say you need not worry uselessly. 

Students from MNNIT clear CAT with good scores. This wouldn’t have been possible without clearing the CAT verbal paper. Students converse in Hindi on campus simply because most of them belong to North India. This won’t have any negative effect on your English proficiency. Also, the professors deliver lectures in English. Other than that, to keep enhancing your English skills, you can join the English Literature group of MNNIT. 

As far as your options are concerned, MNNIT is known for its top notch education in CSE. It is one of the best colleges in India for a CSE program. Also, the placements offered at MNNIT are quite impressive, especially for its CSE branch.

According to me, you should choose CSE at MNNIT over IT at NIT Surathkal.