Is this the part where we all pick our favorites and insist the other options are obviously terrible?
Seriously though, those are all pretty equal level bikes for obvious reasons. I would advise to to start a list of negatives for each bike. Maybe look at the pros if the cons aren't evident enough, but you might find you like one over the other based on a purely subjective reasoning or experience. Example: I'm not a huge fan of BB30 cranks (the cranks, not the pressfit standard), so the Cannondale gets a negative on the list for me. I don't like how Specialized sues everyone. It doesn't mean it's not a good bike, but it reason enough. Etc. Your list will look entirely different.