I built a worn-out and roughened up metal shader to test different render engines in Cinema 4D using the same scene and lighting setup for all five engines. I love diving deep into a node tree to build complex shaders. Some are definitely more fun to work with than others (looking at you Redshift with your ancient expresso nodes).
One conclusion I came to, Arnold, Vray and Redshift are very alike from their basic setup. There's no winner here (as there shouldn't be), each has its strengths and weaknesses. 

Octanes nodetree is definitely the easiest to work with but some nodes are named differently than in the other renderers so you really have to know what you're looking for.
Vray crashed the most, Arnold was quite nice to work with. Corona has all shaders in one window which took me a bit to get used to. Redshift was the most stable of them. Overall a very fun private project. 
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