I own both. wrist straps require more grip effort to hold everything in place. hook straps pretty much remove your hands from the equation, since the hooks 'replace' your hands at the end of your arms, and therefore put less stress upon your injured hand.
Hook straps are also easier to use, as you just hook the bar, while wrist straps require the the wrapping thing. Both have their places. For example, i would use wrist straps on my ME high pulls, while hooks on ME rack pulls.