To the extent I know, choice is between Suresh of Maruthi Tutorials and Sekar of Guru Kripa.One packs more style, behaves hip. The other is known to be crude, but creative. (Exact words of my trainee). The more popular one among the two, if internet is anything to go by is, Suresh. I guess Sekar must be equally proficient, even if not evidenced by chatroom / forum discussions.
I am not aware of how good Mr. Soumiya Narayanan is. I thought he was a corporate law faculty. Am pretty sure of that, since he was handling law some four five years back.
Enquire and decide.