I recommend to go for Audible because it has a wide catalogue of books and most of the people may not listen to more than 1 audiobook a month.

Audible vs. Storytel

Audible has a wide range of audiobooks in its library, almost all books available in the Amazon store has an audible version. It cost you just ₹199/month and you get 1 audiobook free every month.

Pros –

• You can listen to the free audiobooks you get every month even if you cancel the subscription. 
• You can swap any audiobook you don’t like for Free.

Cons –

• Only 1 audiobook is given free every month if you want to listen to more than 1 audiobook in a month you need to buy additionally (@30% discount).

Storytel costs you ₹299/month but you can listen to any number of audiobooks every month.

Pros – 

• Unlimited audiobooks in a month.
• Effectively cheaper than Audible (if you listen to more than 1 audiobook in a month).

Cons –

• Storytel has a limited collection of audiobooks compare to Audible.
• You need an active subscription to continue to listen to any audiobook.