I think Beniers and Power are both excellent prospects.
That said, I think it's more difficult to find a defenseman with Power's abilities and hockey sense at his age, than it is a forward.
And for that reason, all things being equal, I would take Power over Beniers but I won't be upset if Beniers is the pick.
What concerns me is Adam's statement about taking the the guy who will blossom in 3, 4, 5 years from now... and if that's the case somebody like Edvinsson might be in play.