Seo for wordpress - Ultimate Seo or Allinone SEO Pack?


I am trying to use a plugin to assist we with me sep and I have read loads and loads of recommendations about ALLinOne Seo Pack as well as some online training help in how best to use it.

However I also see that you have you own plugin Infinite SEO and my questions are:-

should I use Infinite SEO instead of ALLinOne Seo Pack?
Is it just as good?
Should I use both at the same time or is that a bad idea that will cause conflicts etc?

Thank you for your advice. WPMUDEV Rocks!