I was deciding between those two, as well. I choose the Trek due to very similar specs at $400 cheaper price.
(BTW, Treks, except for their carbon bikes, which are made in Whitewater - are made in Taiwan, mostly at Giant factories).
I test rode the Trek, but my local Giant dealer did not heave the correct sized Trance to ride. So, I bought the Trek.
So far, no regrets at all