[glhaynes]

Slash-divided parts of URLs generally seem to me to describe a hierarchy, both because of the traditional structure of many URLs and slashes' traditional usage as a hierarchical path-delimiter. So I personally prefer your proposal because it makes a to-me clearer distinction between the resource that's being specified and the rendering attributes applied to the presentation of that resource. So it seems more obvious at a glance which parts of your URL could be removed/changed and what would happen and it just "feels" more right.