This is a tough one and its literally a toss-up. Both could be great and both could be just ordinary. I imagine both tenders have stretches of solid play follwed by some clunkers, and so on.
I'd more likely go with Bernier here, for the sake of if he hits, he's a better trade value given his situation and age. So he'd be a better trade piece than Emery would be. So i'd go with Bernier mainly for this reason.