Trek vs. Hardrock, which is better?

I will be soon getting my first mountain bike and I am looking at two bikes. The first is the 2011 Trek 3500, the other is the 2011 Hardrock Specialized. Both are at the top of my price range ($400). Niehter bikes have disk brakes. I usually ride on a loose gravel path that has hills (but not with steep hills) and will have my Siberian Husky running beside me. Which bike is better?