If you would ask me, one of the most comfortable and good for the health of your feet are the flat shoes (or Mary Jane shoes as they are also called). As the name states, they are shoes without heels, which are very great for your health as I previously said.
Bear in mind that the flat shoes are not enemies of fashion. Indeed, if you are very creative and inspired, you could create a fantastic outfit combo with them. Take a challenge if you want.