I own a matrix and have ridden an FS2. Both are great rides, however I'm partial to the Matrix. It is incredibly stable and completely predictable in the surf - really a pleasure to ride and never a work out. In addition, the quality is unmatched. I have nothing bad to say about the FS2 - it is a great boat as well. The Matrix just feels a bit more solid and comfortable to me.
I also want to stress how knowledgeable and helpful Bobby from Trinity composites is. It is really nice having someone who you can call for any technical questions; he always picks up the phone, is patient and extremely helpful in answering any questions. He's just a great person to do business with and I respect his professionalism; he never says anything negative about other products on the market, even when he's standing in front of another builder's busted up aftermarket hull.