Brf is exactly right. I have a pair of Thiels and I love the sound. I had a buddy in the 80's and 90's that had the 2 2's and they sounded great in his home. I also had a buddy in the 90's that had the Wilson Watt/Puppies and his system blew me away. But whenever I heard the Thiels or the Wilsons in stores they were not nearly as impressive. In stores, Thiels always sounded harsh and the Wilsons sounded flat. So over the years I wasn't sure which way to go until I finally took the plunge and bought the Thiels. They didn't sound so great though until I changed amps, cables, source equipment, room, etc. I guess that is what makes this hobby so special.
So would I prefer the Wilson's over the Thiels? If money was not an issue, sure. But the difference is not enough to push me over the edge. I also know that everything in front of either of these speakers matters too.