At this point in your case, it doesn't matter what you use since you don't seem to have a minor understandment of how do they work.I would suggest you first find out how do they work, for what are they good and how blog owners see them.
If I tell you yes, will you take my word for it? If I tell you no, how will you know I am telling the truth? Do you own a blog / website already? What type of comments do you usually approve? That should answer your question.
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