User behaviour: Rating + Comments or Rating OR comments?

I'm debating myself what could be best for the upcoming
redesing of
www.paradondevamos.com in the area of rating &
comments.

I know the comments framework have both, but I wonder for a
site with
blogs & places related to enterteinment for 16-30 years
old people
what could provide the best return (ie: enchance
participation):

- Let rating & comment in one step or
- Comment & rating apart.

I think is best the second, maybe because people that hate
writing
perhaps could rate. In the other hand, if simply rate but
not say why,
the content get less valuable????

What do you think? Exist any emprirical proof?
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