Originally Posted by
Iride01
Do you buy Ford, Buick, Chevrolet, Nissan, Toyota and etc?
It's much the same.
I'd pick the one that calls to you the most. If these are from different dealers in your area, then pick the one from the dealer you think you can get along with the most. If you are buying online, then one that has a authorized dealer/service near you so any potential issues and questions can be addressed first hand in person.
My lbs is a Trek dealer and I went with the FX1 XL frame size. I decided not to worry about all the details and went with a bike that felt good when I was on it.