They're both good brands.
That's all really anyone is qualified to say, picking out which pack is right for you is very subjective.
My advice, stop by your local outfitters with a couple gallon jugs of water, find one of each of these packs that's sized right for you, put the water in them one at a time, and walk around the store for a few minutes. Buy whichever pack proves most comfortable to you, whichever one works best with your methods, and distributes weight in a way that works best for you.

Whatever you do, do not buy a pack sight-unseen without trying it out, chances are it won't actually fit right.