What is the best crock pot? The programmable ones or the old-fashioned knob style ones? Any favorite brand?

I'm looking to buy a new crock pot and I'm not sure which is the best one to get. The old one I had was an old-fashioned type with a knob and three settings (without a meat probe). Which brand is the best (Rival, Hamilton Beach, Crock-Pot, or some other brand)? How often do you use yours?