Thank you for your question. Please find below the difference between both the royalty options: 70% Royalty
Includes Deliver Cost for every sale
Price should be between 99 INR and 449 INR
eBook should be exclusive to Amazon KDP to get 70% royalty in India (Recurring 90 days period)
You need to own the copyright
Book Lending (KOLL) is mandatory
No Delivery Cost involved in eBook sales
Price can be between 49 INR and 10,999 INR
No exclusivity is required
Public Domain books get only 35% royalty
Book Lending (KOLL) is not mandatory
Based on the differences above, we would suggest that 35% royalty is the best way to go in the Indian marketplace as you have the option to sell your eBook on other platforms like KOBO, iBooks, Google Play, etc.
You can go for 70% Royalty option, if you are planning to make your eBook exclusive to Amazon KDP (Recurring 90 days period), and get the 5 promotion days, where you can sell your eBook for free.