Thanks for the replies. Yes, I have tested both rides and I couldn't really pick any difference between them. But I also did not have my full gear with me - shoes, gloves, helmet. I am saving at the moment to buy the bike, which I won't buy until June. So I am putting in the research at the moment.

As for the TCR vs OCR, I noticed that Giant have put out a new OCR range. I have the older one - 2003. I will mainly use the bike to commute, but I do like to go on longer rides at the weekend.