Best Android Smartphone?

I am considering trading in my iPhone 5 for an Android Smartphone. My contract is not up, so I would be paying full retail price (less what I could get for my iPhone).

My question for you guys is what do you think the best Android phone is - and why? I am on Verizon otherwise the Nexus 5 would be a solid option. Right now my favorites are the Moto X and the Galaxy S5.

I know the S5 is going to be the phone to beat, but my favorite feature of my iPhone is the build quality - a department in which Samsung seriously lacks.

So, what do you think?