Personally I would go with the Felt. I have experienced first hand the support Felt has for its customer and I felt as though I was royalty. When I tried to buy an F4 and none were available and I waited for a long time, Felt and the bike shop worked it out and I got a F2 for the same money. Not to mention the trouble free service my F75 has given me it would be a no brainer for me. I really can not speak of Specialized as I have never owned one of their bikes. I know that when I get home after a ride I never once thought I should have bought another bike. I do see your point about being able to ride either one all day long and if they are that close I do not envy having to make that decision. I will say the Roubaix looks a little better appearance wise.