I buy the cheapest type because I lose them constantly. I subscribe to the "saturation" model of losing things - keep buying the item until it saturates your environment and you starting finding hammers as fast as you lose them.

(In my defense, I have a big house and it's still mostly uninhabited - I just found a hammer in the master bathroom that I'd left there three months ago. I hadn't been there for three months; there's no working plumbing yet.)