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Personally I don't use those type of plugins at all. I'm not familiar with YOAST SEO plugin but I know well how All in one SEO works. First of all it sufficiently slows down the loading time of the site, which is not good for Google.
The second problem is that all those "tweaks" are not just useless, they are harmful. The plugin author says you need to hide some sections of your site (e.g. tags etc) to avoid duplicate content for Google. That's a very bad idea, because Google knows what WordPress is (about 25% of all sites in the Internet now work on WordPress). The search engines know that original articles and their "copies" from categories, tags, archives, search results etc are not duplicates. So course your site will not be penalized for that. Furthermore, when hiding any of those, you will lose a lot of SE traffic. For example, I have many sites that uses keywords I'm targeting as tag names, and those tags are getting the biggest part of the whole SE traffic: the hits come to the URL's like myblog.com/tag/KEYWORD.
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Obey the Cowgod
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