Seems like MR is good at reflecting textures accurately.
MS is good for scenes where there aren't any textures, but those textures can be imitated.
Seems when it comes to reflection and textures, MR renders faster while MS is slow. But when fur is added...(see pics 3 and 4), MR slows down to a crawl, MS renders it at 46 seconds.
So which should I stick with and why? I can see workarounds to MS problem with textures (since I might not be adding too many of them and less likely to happen in reflective environments), but no workarounds to MR's slowness.
MR also doesn't render reflections of fur either with Production settings.

Why does neither of them render the shadows in a reflection though?
I've googled on this topic... Nothing found related to reflection omitting shadows except an unanswered topic somewhere, the user had problems with rendering a ball reflecting into a mirror because the mirror didn't reflect the shadow of the sphere.