OP, what you should take from this thread is that for the money you are spending, whatever you choose will be a terrific bike. That being so, you should be guided by what feels best to you. And if you can't tell much difference on feel, either choose the cheaper one or buy the one you think looks best. Bear in mind that the pros don't care what make they ride, because they know that the high-end models are pretty much equally competent.
And as a 50-plus 6'3" 200 pounder, I can tell you that the supposed difference in comfort between the Roubaix-style bikes and the "pure race machines" is much less than you might imagine. If the bike fits you, a "pure" racing frame (and that isn't easy to define) can be set up to make you very comfortable.