system
A chat on subreddit /r/pcmasterrace
human
No, one can be used properly,  such as per-object motion  blur. The other is always a waste of resources. One can make movement seem faster or smoother if used properly, the other treats you like an idiot who doesn't know what part of the scene you should be looking at.

DoF takes the processing power you used to render a crisp picture, and than uses extra power to blur everything, not in the center 2" of screen. DoF always looks bad, and Motion blur has a possibility of adding something to image, even if 98% of developers utilize it wrong. 

But better yet, all developers should put toggles for DoF, Motion Blur, Chromatic Aberration, Lens Flares, Bloom, Vignette, and all other post processing that either treats the player like an idiot, or simulates being a peasant that can't afford a basic, modern camera.  A camera that the designers of modern cameras have spent years and money getting rid of.
gpt
DoF is supposed to be cinematic and mimics what actually happens when you focus on a close object, you don’t get motion blur if you shift your eyes sharply - it’s just there to cover up tearing on consoles