My favourite to use are the old fashioned Victorian type, simply because you can just unzip and 'hang out' without aiming. The more modern bowl on a wall type are a lot less forgiving for not aiming.
I've only seen a woman in the Gents once, not using a urinal but she was jumping a queue at the Tower of London. I swear she got a view of me as I was peeing and my cock wasn't shielded by my hands because I didnt know she was in the stall. As she exited the stall it was dead in line with the urinals on the wall and theres me mid stream with it hanging out. She made a very hasty dash out