Search engine traffic versus link traffic.

[newsguy]

I've always read (and it makes sense to believe) that search engine traffic is the best kind of traffic because it's very targetted--people are actively looking for what your site contains (usually).

But one of my sites in particular gets a lot of traffic from a link that's on another site with a similar theme. Would that traffic be just as good as the search engine traffic? What do you think?