I have been using a mac since last 5 years and I am very comfortable and used to the iOS ecosystem. Just wondering if Tier-1 firms allow you to use your personal laptop. I know CAM, SAM and AZB does. What about Khaitan, Trilegal and others?

this is THE question to ask! for people using MacBooks, it's going to be devastating to turn to a Windows system.

KCo doesn't.

What about Trilegal?

trilegal didn't allow interns (2020) to use their own laptops, I doubt they allow associates.