MyBB Community Forums

Hi guys,
I'am using mybb's feature Sef Url's. But i wonder is there any disadvantage of sef url option than google seo plugin?
SEO plugin makes our url's like domain.com/new-thread-name
but the sef url just make it domain.com/thread-6 
is it so important for google?

merits of using google seo plugins is that it converts your url to human readable form (keywords urls) and google also prefers keyword url so it will definetly improve your seo. Features of google seo is documented here http://community.mybb.com/thread-101262.html