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When designing the main characters, I deliberately wanted them to holster their guns in different ways, so that each conveyed a slightly different personal style to flesh them out a bit more. Physically, Ril was meant to have arms on the shorter side, so it made sense for him to keep his gun within easy reach on the shoulder. Plus I always liked the look of those police detective shoulder holsters.
Shoulder holsters are good for concealment, but for quickness, nothing beats a low-on-the-hip breakaway.
Well, unless you can master a sleeve-holster, but those are .. difficult
True, a hip holster is probably best for quickness. I figure in most instances, they aren’t worried too much about Western-showdown-type quick draws though. They pretty much go into potential trouble with guns already drawn. That being said, being the resident weapon aficionado, I wouldn’t be surprised if Ril did have some sort of spring-loaded sleeve weapon.