I would say that these bikes are VERY similar in components. The GIANT has ALEX wheels which I aboslutely hate...(I've had customers with bad experiences with several of their lower end wheelsets). Both bikes are mostly Shimano 105...I don't know much about the Xero Wheelsets on the Specialized.

So in my opinion is FIT. Getted fitted and test ride them both...My guess is that they should be priced pretty close...so whichever feels better...