What is best thermostat brand ?

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Last spring - I replaced the Super Stant thermostat in my Mercury with a Motorcraft thermostat. The heater seems to warm up quicker, but coming down long hills (think the Grapevine or Southern Oregon) the temperature gauge would dip down about 25 percent or so. With the Super Stant thermostat the temp. gauge would stay steady at the half way point under all conditions.
 
I just replaced my thermostat in my F150. I picked up the premium one at NAPA, part number 555090 because it was $10 less than picking up the Motorcraft at the Ford dealer. The box has Superstat on it, and made by Stant. Well, I open the box up, and the thermostat is stamped Motorcraft with part number 8575. It looked the same as the Motorcraft that I took out. So, it looks like Stant is a supplier for Motorcraft.
 
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