EDIT: I think I mixed up (2.8) Clay “Preview” Render with “Clay Render” :o
—posted earlier —
Clay preview render is cooler than Solid with AO. For better modeling and scene blocking. I’m used to ZBrush’s auto-polygroup by random hues. Helps a great deal to differentiate objects/ vertex groups when modeling or laying out scenes with lots of objects and parts. Real workflow enhancer.
Would be very happy if Clay preview render comes with a “pastel” tick box!
Different pastel hue for every object in Object mode. And in Edit mode, dynamically group face selections by hitting a clay preview: random hut icon/hotkey. 
Tinted clay dough…
Anyway it’s no big deal in the scheme of things… will make Blender tuts look more inviting that’s for sure…