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i'm not sure if they really have too different effects on each other, but i think the one on your forearms is a lot harder. i can only hold that for a minute or two, but in the upright position, i can stay up there for a lot longer time.
I would say neither of those pictures are a "proper" plank. Yes, it should be on the forearms, but with your back and legs straight (not bent in the middle with your arse in the air)
First photo looks dead-on to me. Second one the butt is a bit high.
As for the difference between the two, people who lack shoulder and arm strength will find it harder to hold the plank on their hands, while those who lack core strength will likely find the elbow plank to be more challenging. As the angle of the body becomes closer to parallel with the ground, it becomes harder for the trunk muscles to stabilize and maintain form, though having the elbows bent takes a lot of pressure of the shoulders and arms.
"In theory, theory and practice are the same. In practice, they couldn't be more different."
"You can have anything you want, but you can't have everything you want."