The thing I like most about SPF is the organization of the forums (easy to find things after you get over the initial shock of the site's entirety). There is always room for improvement no matter what site you prefer. Here though, people are fun, professional and very helpful. The added bonus is that SP strives to promote member contribution, which in turn promotes out-of-the-box ingenuity. Alot of other forums I've seen lack in this area. Pretty smart if you ask me.
But hey, I'm just an SPF addict beyond the addiction. What do I know?