I like them separated by manufacturer, arranged by model, then caliber in a glass display, if they are on metal stands, that's a plus. Used guns need to be in a separate case of their own. Ditto on the tags being visible of the same information & most importantly $$$$$
I like them being separate by manufacturer, because it makes it easier to look for brand X.
I like them being separate by manufacturer, because it makes it easier to look for brand X.