So far, I see all this hype about Arnold and no doubt, with its material and mapping options, you can do A LOT with it.
However, I find ART to be much more intuitive and friendly with providing a more clear view in active shade more quickly than Arnold for the same scene.
It seems easier to tweak exposure values to what you desire as well.
I will be posting later a scene rendered with Scanline, ART and Arnold with the approximate render times.
So please keep developing ART. I don't know why I don't hear of more artists using it.
I hesitate to say the it's lacing the psychological effect of it being a "3rd party" and therefore "better."
Anyway, I would like to see more clear material editor representations and better noise reduction. It does take quite a few passes to eliminate all the noise but the image is amazingly photorealistic.
Anyway, I know "keep developing" is a bit vague but the point is don't let this go by the wayside because the hype is so much on MR, VR, and now Arnold.