The Giant Contend is brand new for 2017 (not even in-stock at dealers yet). So you'll be hard pressed to find exhaustive reviews. The Crossrip is pretty popular at our shop (we sell Trek & Giant). A couple things to consider, seeing you've mentioned that you're looking for a commuter.
Do you require rack/pannier mounts? Or are you riding with a backpack? How about fenders?
Which of these bikes have you ridden? What did you like about the ones you rode? What didn't you like about the ones you rode?