I would beg to differ, that is, depending on where you live. Here in Vancouver, BC, you seldom ever get a chance to wash and wax your car from November to April due to the winter rains/snow. I would imagine the same would be for everyone else living in Canada and the northern half of the USA!!
In this case it's almost imperative that the longest-lasting and most durable wax/sealant be found and used, hence my query.