No substitute for actually riding them and picking the shop that will provide the best service.
When I bought my road bike, I was absolutely certain I wanted a Trek Domane, until I rode the Madone, the Specialized Roubaix and Tarmac, and the Giant TCR and Defy. Any of the bikes on my list would have been excellent bikes, but when I rode the Defy, it fit my body better than the others, and it was at a shop that gives great service and advice. The process took a couple of hours and a return visit after I'd slept on the decision, but I ended up with a great bike and a good relationship with a great bike shop.
BB