I have both tops, the 3 piece hard top, and the canvas top, and live in a hot climate. I tried the canvas top, found it was like being in a canvas tent, put the hard top back on after a week of 90 plus, and the canvas is sitting in the rafters of the garage, probably will never use it again.
While the hardtop is hot to touch, the A/C does cool it down when it is 100 plus outside. I would recommend investing in the after market insulation pads, they will make the A/C much more efficient in the summer, and helps with heating during the winter.