The only difference between the mobile version and the pc version are the buttons. It doesn't affect the story in any way. However if you are planning on getting the paid version with episode 2 and onwards then I reccomend the pc version since its actually cheaper and I just generally like it more then the phone version. At least it cheaper in the country I am in. I am not sure if it is the same as the US or Russia. (For reference in my country its 699 for the phone version and around 417 for the pc version.)