There are many different types of siding: vinyl or aluminum, wood, wood shingle, brick, cement fiberboard, asbestos, stucco. Much of it is local or regional preference, or may be characteristic of a particular style of home. It largely depends on personal preference, based on aesthetics, cost, ease of maintenance. Some buyers seek out particular siding while others avoid it. It's just another factor in the decision whether or not to buy a particular property.