Om Pandey or Amitabh Sharma?

Arjuna JEE 27 is soon going to start IOC

I know 2 things..

a) Om sir for clarity , Mains focused

b) Amitabh Sir for Advanced level

I want to ask

1. is Om sir also good for Adv level ?

2. is Amitabh Sir give equal knowledge to make Mains base clear too? as it's imp to move on to Adv ..

Seniors please give your views