I think they're both kind of lame, but if it's just some informative or interesting link about some anime-related news, who gives a shit where it came from? I'd rather people post anime news links from CR than not make the post at all.
CR is only lame because the forums are lame, right? They also seem to regularly cater to a younger and more annoying audience, too, so I guess that makes for a pretty lame image. You guys can't possibly be mad that they're catering anime to western audiences for a subscription fee, though, can you? They're helping to fund the anime industry, so that's no reason to dislike them.
I wouldn't flip shit or derail over links to sankaku or CR simply because that's where the content is hosted. If it's a stupid link, I might more annoyed, but whatever.