I haven't used the Turtle Wax but I do use the Collinite 476S and I've purchased it more than once
It's dead easy to use. It comes in a tin, you just dip your applicator pad into the wax and apply a thin coat over the whole car and buff off 30mins later, repeating a few hours later. It's so easy to use I could train a dog to do it.
It outlasts any other wax on the market.