BobCo...good question. Honestly...I'm not sure which would do better. If I had to guess, I would have to say the one at 5 yards would probably win out, since it is still accelerating(if in fact it was still), and is probably going straight(er) upon impact than the longer shot would be. But if you look at it by the numbers...that would tell you that they should be the same. The numbers probably aren't always right, there's too many other factors involved in penetration other than just KE.
What do you think?