Biggest screen in Gorakhpur

I recently went to watch the Odyssey india Audi 4 of Orion and I'm planning to watch Spider Man next week. Although I should have asked this before watching Odyssey. Among all the cinemas in the city which one has the best viewing experience / biggest screen / best audio quality. I've heard AD has the biggest screen but ain't sure. Also why's it that when we book tickets AD has Dolby Atmos written, do the others don't have Dolby?