I've been using pointed ladders for about 10 years and I'd never ever ever go back to a normal ladder when trading windows.
They're much, much more stable, can be put to the left or right of the window or on the upright spars. Also, they're much easier to use on ground that is not level and the rubber end grips much better than aliminum or the hard plastic ends of a normal ladder. On top of that, the base of an A frame is much wider.