It will be very harsh when you are comparing the two different singers and their capabilities.

As it is uncomparable between an emerging star-like “Ayushman Khurana” and well-established star “Salman Khan” or “Shahrukh Khan”. In the same way, it is unjustified to compare these two singers.

Shreya Ghosal has a melodious voice and won numerous awards containing National Award twice or thrice. The list of awards will make you know how praisable singer she is at such an age.

Awards of Shreya Ghosal (Source Wikipedia):-

Now when we talk about Neha Kakkar, she has some good item songs or remix songs making kind of voice. Kakkar possesses a contralto vocal range and has the ability to reach E5 notes. She is doing good and is nowadays the busiest singer of Bollywood, Kollywood, etc.

Neha Kakkar’s Awards List:- (Source Wikipedia).

So, the above two pictures show the ability and capabilities of both singers. Thus, at the beginning itself, I said it will be harsh to compare among these two singers.

I hope you liked my answer and some Neha Kakkar or Shreya Ghosal fans please excuse me if I was anywhere wrong. All the above contents and details are my own thoughts and are not meant to make anyone feel bad.