Having Different SEO plugins Installed?
 

Hello.
In order to have a SEO friendly on my site and to avoid having to write the 'title' 'Meta description', .. etc. for every page, I installed SEOSimple. In its documentation it says:
"This plugin generates the meta data "on the fly" when the page is loaded. However, I couldn't , it does not save the meta data to the content's meta data fields seen in the Joomla editor. These fields can then be used to override the auto-generated meta description generated by this plugin. To see the plugin at work, you must view your page's source in your browser."

However I couldn't see generated codes. So I didn't get any feed back regarding how good it works.
So, I installed SEO Boss. After activating the latter, I could see some of the codes.
Consequently, I am intending to even install a plugin in order to have 'Key Words' automatically created. I had already installed ARTIO JoomSEF, but it is now inactivated. My question is:


1) IS THERE ANY CONTRADICTION/PROBLEM INVOLVED IN INSTALLING DIFFERENT SEO PRODUCTS?

2) WHAT IS THE THE MOST EFFECTIVE SEO FRIENDLY PLUGIN?

Thank you.