2013 Kona Jake, 2015 Kona Jake the Snake, 2008 Kona Major Jake, 2013 Kona Jake the Snake, 2006 Kona Kula, 2012 Ridley Excalibur, 2008 Surly Long Haul Trucker, 2001 LeMond Buenos Aires, 1984 Pinarello Gran Turismo, 1982 Trek 614, 1979 Austro-Daimler
It's a toss up. The Giant has internal cable routing, which is nice but also sometimes a pain. The C'dale has a BB30 bottom bracket, which is nice unless it starts creaking.
The crank is better on the CAADX. The brakes don't excite me on either one, nor do the wheels.
If you plan to use it for community/utility cycling, the Giant looks like a better choice. The cheap carbon seatpost on the Giant would worry me for racing.
I guess I'm not helping with the going in circles thing.
I don't have any experience with the Giant, but I have a CAADX 105 (with canti's) and it is rock solid. The bike is light, stiff and rides great. I'm almost done with my first cross season on it and I've had zero problems.
I don't really like mechanical disc brakes and wanted to be able to swap road wheels onto it, so I was happy my LBS had a 2013 left before they made the switch to disc.