The most often downloaded SEO plugin for WordPress probably is All-In-One-SEO.
A little less known, but in my eyes superior is Platinum SEO Pack . I decided on Platinum SEO for all my sites quite a while ago and while my information may be outdated today, I nevertheless want to share the reasons for my decision:
Platinum SEO and All in One SEO Pack look very similar at the first glance. That is because the author of Platinum SEO formerly used All in One SEO Pack, too, but then improved it because of missing features.
So why did I choose Platinum SEO over All in One SEO Pack? Personally I’ve chosen to make use of Platinum SEO for the following reasons:
1. There are some on-page optimization settings that are missing in AIOSP
2. It allows to set single pages to “noindex” and thus keeps SEs from indexing a website I don’t want listed.
3. Platinum SEO has a feature called “Automatically do 301 redirects for permalink changes”. Which means that you can change the permalink structure of your site if you want to optimize it and still older links to the old structure will not result in “404 page not found”
4. You can switch off the credit back link and are not pushed too hard to make a donation
If you’re already using All-in-one SEO, Platinum SEO has the ability to migrate all your current settings into it’s own setup, which comes very handy.
So a final thought, the key reason I changed was for the ability to set a single page as “nofollow” to hold google from indexing it. In addition to that they are both comparable, and may actually do equally good jobs at SEO.
If you like AIOSP better don’t worry – it will probably work just as fine for you as Platinum SEO does for me.
I will conclude this article with a good article I recently found on the net, and although it was written for AIOSP it actually works with both plugins:
This AIOSP tweak boosted my rankings