Kindly advise

Respected experts, I am little confused kindly educate me. My father passed away without leaving a will. He had the following: 1. A plot of agricultural land 2, A bank Account ( Rs 17000) 3. A few shares My mother is alive and I am the only son. Now for transferring the above we should get Succession Certificate or Legal Heir Certificate ? Which one is useful in my case. Succession Certificate is a long drawn process I have heard. Please clarify. Regards