I personally go with the widest handlebars I can. You might gain some aero from skinny ones which would be worth it if you are racing at a high level but you will lose a significant amount of comfort. Wider bars allow more hand positions and are significantly more comfortable for me especially on long rides. Being able to really get a wide grip occasionally feels great on the shoulders. And on top of that you feel much, much more secure with a nice wide grip on difficult terrain like shitty pothole laden roads.