The theatrical ending is TONS better then the Alternate ending. That Infinifilm has a few extra scenes that lead to the alternate ending.....SPOILERS BELOW!!!!
There is a scene where Ashton sees a Psychic and the psychic tells him he has no life line and doesn't belong alive, his mom also tells him that he was a miracle cuz she had 3 miscarriages or still borns. Then the alternate ending is different as instead of the family film he watches when he meets Kayliegh, it is a video of his birth and he goes back and kills himself before he was born, making him another still born and showing us that the 3 previous miscarriages or still borns his mom had, most likely had the condition Evan had and ended up going back to when they were born and killing themselves. Kind of out there. Liked the theatrical ending MUCH better.