and why.
My vote is on Cointerra.
http://cointerra.com/Why? They have the most powerful machine, confirmed at 1.63 - 1.72TH in initial batch and improving.
They ship pretty much on time.
They have the best technical team in the world.
They are the most transparent company.
They do right by their customers, when they come up short on specs, even though they are still very good they give future discounts, free machines offer refunds etc.
No, I don't work for them, or know anyone who does.