Don't use Node if you have a lot of CRUD, because you'll still have to do a lot of stuff manually. Node's ecosystem is relatively young which means you'll have to do a lot of manual labor (as opposed to something like rails and mature, production-ready gems) and stitching of components. It cat get messy rather quickly, so my advice is "the right tool for the job".
These guys nailed my point pretty good: http://www.perfectline.ee/blog/optimizing-ruby-on-rails-appl...