yeah comfortability is an obvious and main choice. i used to play in shorts and flip flops all of the time, but i cant do it anymore. even though i still wear them on a daily basis because of the hot weather, but i dont prefer to play pool in them. i have to wear pants and shoes when i play now. i know that sounds dumb but its probably my OCD coming out.
i like shoes that are not too grippy or not too slippery, something right in between. if its too grippy like a new pair of running shoes, my feet are constantly skidding on carpet or what have you. if my flip flops are too worn out they become too slippery, and if i have to reach for a shot with one foot on the ground it becomes very uncomfortable. lately ive been wearing nike shox, and i dunno but the heel of them kind of gives me more of an upright/taller stance that i like. the weight is also towards the back of the shoe which makes me feel more planted in my stance. if i feel any bit shaky in my stance i get uncomfortable.
to one their own. i think i remember hearing a commentator say earl made johnny go run across the street to get him a different pair of shoes before a match because earl didnt feel comfortable in them. lol