seo plugin for my users

Hi today im looking closi to the avaible wordpres seo plugins
yesterday i whas confince to buy the seopressor here so much good about it

but kow im choosing between this 3
seopressor
Easy Wordpress SEO
clickbump-seo

all 3 dont have demos so im asking
wich one is realy the best
come tel me from y experince
thank y