Pros
Its good to study and take your coaching at Fiitjee because they provide a competitive environment for studying and preparing for jee.
Cons
The class strength should be low so that the teachers can take proper care of each student and help them achieve their goal.
So I recommend you to join east delhi centre, if you are in delhi so you get proper attention from the teachers. I prefer not to join south delhi centre as there is a lot of rush.