As far as "Choose your own adventure" style of book goes, Tin Man Games made a wonderful job in integrating technology in it with the Gamebook Adventure series! This new sci-fi book improves the rules with skills, which is great!
The price, at 4.99$, may be a bit steep compared to many other apps out there, but to see this genre revive in such a nice way makes me want to spend that 5$ without remorse.
Shimoru about Gamebook Adventures: Infinite Universe, v1.1