I'm going to India and I'm watching some youtube videos where travellers go into the jungle over an elephant to try to see wild tigers. Most of them didn't see anything. I would like to know which park I have more chances to see them.
India has approximately 39 designated tiger reserves in the country. The most popular ones are Corbett National Park, Periyar, Sundarbans, and Kaziranga for the purposes of "tiger tourism", but I recommend you to look at the list on Wikipedia and narrow down on the ones with "good tiger density" on that page that fits closest to your itinerary.#
The thing to remember that that tigers, after all, are wild animals and they hate human contact as it chases away their prey. With increasing levels of tourism, the chances are that these days you're less likely to see a tiger in the wild than, say, 10 years earlier. Nevertheless, the guides at the nature reserves try their best to follow fresh trails - you'll at least get to see tiger trails, if not the actual tigers themselves. It might be disappointing, but it's charming in its own way to be that close. The point is conservation of tiger habitat, after all.