I liked the work culture in my team.
Challenging problems to solve (In my team).
Helpful seniors (In my team).
Cons
Salary discrimination between IITs and other colleges. No direct way to bridge the gap even after good performance reviews, spot award, etc. (I got 20% hike which is not bad but would take 3-5 years at that pace to match a salary of an IIT fresher from Non-CS background at the same company)