There are around 26 bones in each foot of yours which helps to walk or running. Each of those bones work together to helps you walk or run comfortable with proper movement of foot. Arch provided by these 26 bones is the reason we walk with stability without any balance problem. For some people arch of the foot is less or do not have arch, people with that condition should consider buying shoes specially made for them with extra cushioning .
Stress put on body by walking is entirely different from stress experienced while running, , tennis or any other physical activity. So it is better to buy shoes specially made for walking. With good pair of shoes we can increase overall benefits of walking. When buying best walking shoes always prefer shoes which provides enough room for foot, expecting break in period for walking shoes is pointless. If you have back pain or joint pain , select shoes which have good cushioning than shoes with stability.
Buy shoes with dual or triple density mid soles, it will make shoes more comfortable and durable. Shoes which have flexibility at the ball of the foot is good for getting better arch support. Outsole of walking shoes should be made of durable and shock absorbing materials, which provides traction and comfort while walking.