So I have been training with weights and recently decided to switch over to bodyweight training for a change, and I bought the Naked Warrior by Pavel (great book by the way). Anyway, I have been doing pushups like the man in this picture with the upper arm perpendicular to the body,
but in the book by Pavel, he does pushups with his elbows parallel to his body, like this lady below
After seeing Pavel's form I have tried them that way and they are harder than the way I have been doing them. Is one way better, safer, or more effective than the other, or does it not matter?

but in the book by Pavel, he does pushups with his elbows parallel to his body, like this lady below

After seeing Pavel's form I have tried them that way and they are harder than the way I have been doing them. Is one way better, safer, or more effective than the other, or does it not matter?