I think LinkedIn is a good resource, because like MOZ it has a rankings and referrals system, but it showcases a broader range of individuals.
With SEO it really depends on what skill-set you are looking for. I find that the MOZ SEO scene is mostly populated by technical SEO mavens rather than content stars. Even in SEO people have specialties. Are you looking for Social Media Marketing? Someone who is really awesome with analytics? A writer, who can optimize your pages and text content using keywords, while creating stylish copy? These skills don't always come equally in the same package.
That's why LinkedIn might be a better bet, because you aren't limited only with the SEO pros who like MOZ. As much as I'm a Moz-er, there are other programs and forums, but there's only one LinkedIn. And yes, I do freelance SEO;)
