We have upgraded our standard black vinyl to a true three ply. The end result of standard is a firmer underside that results in less stretching, less wind flapping and 100% mildew resistance.
Colors provide a great custom look and use a thick woven white polyester thread on the bottom for strength but the underside must be maintained to resist mildew.
The Canvas is similar to a convertible top. The topside is a cloth texture with vinyl on the underside for water penetration.
They each have their advantages and disadvantages. The strongest is the standard black but the strength makes it a little more difficult during assembly because it doesn't stretch easily. The deepest black and nicest look is the canvas but toughest to keep clean.
Colors options are not refundable.