I think you can't go wrong with either. I have a Veloce and my husband has a carbon fiber Giant (the OCR frame, though; he does wish he'd bought the TCR). I haven't ridden his Giant, but he's ridden mine, and he says the Giant is much smoother on long rides but the Veloce is springer and more fun on sprints. He has suggested that I get a carbon fiber seatpost to reduce some of the road vibration; he thinks that would make a big difference.

How do you feel about Campy versus Shimano? That would be part of the equation, too. The Eros has Mirage, right? That felt really cheap to me in comparison to Veloce. My husband's bike has 105, which he likes fine, but I know you have options with the Giant, although those change the price range pretty dramatically.

Basically, I think they are both great bikes (clearly I am biased!) and you aren't going to make a bad decision either way.