I'm in my running shoes a lot: I've set out to run a marathon in 30 different countries, raising money for local organizations in each one. Running race after race, I look for comfort and reliability in a shoe. I want to be sure every day that I'm getting the same fit as I did the week before, and that my feet are happy after 18 months of travel and running.
If you have flatter feet then running shoes with more cushioning is the way to go. Having extra material to absorb impact on ground strike will translate into more distance and less fatigue. Runners with a more neutral foot type can make selections that are considered more “middle of the road”. Make sure you also check the way that your old shoes wear on the outsole, this can tell you a lot about the way you step.