A rotary is not for the faint of heart. An orbital like the PC7424/7436 is much safer and used with the newer compounds (HD UNO, Meguiar's 105 etc) it is almost as effective. By the way, I had a PC and sold it, as I stayed rotary exclusive. Practice on scrap panels with the rotary before doing your car.
Regardless, they are intended for polishing and paint correction, using either of them to apply wax is overkill, and specially, if you already got practice applying wax, you'll do it faster by hand.
Get this to apply wax
HD UNO Duo pad exterior Orange side for hand polishing or working cleaner waxes, red side to just apply wax.