If possible ride both and then decide. When looking at high quality hybrids there aren't many to choose from. I purchased a couple of Giant Escape RX Composites earlier this year and couldn't be happier with my choice. Currently have a little over 2k miles on them and they are perfect for our (my wife and I) lifestyle here in FL. Usually ride 30 to 40 miles/day. There are a couple of threads covering the RX Composite on the boards. Here's mine if you haven't seen it. http://www.bikeforums.net/hybrid-bic...e-owner-s.html Good luck with your decision but you really can't go wrong with either bike.

One thing I really love about the Giant RX is the rack mounts and it has fender eyes as well. Not many carbon fibre frames with either one let alone both. Here is a thread covering the rack mounts I did a while ago. http://www.bikeforums.net/hybrid-bicycles/941533-you-looking-carbon-fibre-
framed-hybrid-rack-mounts.html

That said the REAL winner here may be the new Diamondback Interval Carbon Flat Bar Road Bike at Performance. Less $$ than the Giant but almost the same bike including the rack mounts: Here is a write up Diamondback Interval Carbon Flat Bar Road Bike | The Performance Bicycle Blog Listed at $1229 on sale here: Diamondback Interval Carbon Flat Bar Bike - 2014 Performance Exclusive -
[h=1][/h]Good luck on your quest