Hi

Both NM sir i. e Namo kaul sir and Nv sir are good to study physics online.

Choosing the best out of these great teachers is quite difficult , I have attended online classes of both these teachers and personally I have liked Namo Kaul sir more than NV sir because of easy way of his explanations, so for me Namo kaul i. e NM sir is better than NV sir  but it may vary for you as sometimes  you are better able to understand  from  a particular teacher.

So, what you can do is attend the class of both these two teachers and see with whom you can understand the concepts easily and then you will be easily able figure out that out of  these two teachers which one is the best for you

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Thank you