For game play I prefer a prop appearance which is neither completely smoothed out nor trending toward a rather 'short-exposure', sharper aspect. A mostly smoothed look which retains sufficient structure to gauge RPM changes is good for me. This permits to match power settings with the section leader when formation flying, yet avoids a too-large fluctuation in scene brightness when looking through the prop. Moreover, a sharper prop when rendered at slower rotation is a jarring departure from the real-life visual appearance.
But for movies and gun cam clips, a suitably 'sharpish' prop looks good.
I would like to see a means to select fom a couple or few renderings for props via a menu in-game. This could be executed by assigning some number of slots which the user first populates with his/her selections, ideally being able to supply one's own name for each. Like, for example, "Smooth disk", "Mostly blurred", "Gun cam", etc.