Greets from my side. If you want see the Bengal TIger then Indian Sundarbans is the best in India. But condition of the Indian Sundarbans are very poor, many people live inside jungle in permanently. Inside the juncle there are have a hospital, but not pet, human hospital. in this Indian Sundarbans have maximum 70-80 tigers.
I think you didn't ever heard Bangladesh side Sundarbans. It is the biggest mangrove forest in the world, double of Indian Sundarbans in size. more than 400 world biggest Royal Bengal Tiger live there. 230 categories of birds live there and many more.
So, I believe that If you want to see the Royal Bengal Tiger then You should must come bangladesh.
Best for your wallet I guess Typical to say bad words about the Indian side, and praise the Bangladesh side. Do you think we are stupid?