2001: A space Odyssey
The Maze Runner series
and tons more I can't remember right now!
If your talking about Minecraft as the actual game, then yes, its only one singular purchase, a subscription is needed for realms though which is just a hosted server for your friends to play in. but the actual game is just one purchase.
I recommend your iPad, since the screen is bigger and it will be more enjoyable. the downside though, is that the touch buttons will probably be a bit awkward, but iPad (in my opinion) is the way to go
There are tons of ways in beating the dragon, but here are some tips on how not to die and save your godly gear from possibly being lost.
(1 Bring a bucket of water, so if you fall you won't die; so you can safely climb the pillars.
(2 bring an I infinity bow. it will help ALOT
(3 lots of G-Apples and Notch Apples
(4 your best sword
and that's all the tips I can think of, good luck with beating the dragon!
Ok, so, here's all the versions explained.
Minecraft: Story Mode - Contains Episode 1-5 of the main story, with 3 extra episodes available for purchase.
Minecraft: Story Mode The Complete Adventure - Contains Episodes 1-8 (So that means the extra episodes) at no extra cost. It's all one purchase.
Minecraft Story Mode: Season 2 - Season 2 is a continuation or sequel to the regular Minecraft Story Mode. And includes 5 episodes at no extra cost.
Hope this helps you!