Fully agree as i still have both. The ATC, thanks to an exceptional midrange driver and a paper coned bass are much easier to listen to and overall more musical. When dynamics and soundstaging is concerned though, the Wilsons, when properly driven are head and shoulders ahead. Perhaps it's the much better enclosure.
However, my hobby is about building amps and sources, not speakers. The Wilsons present a really challenging load to the amps, very few SS amps are capable enough to reveal any of the positive qualities they have. In this sense it's fun having them at hand. If an amp can demonstrate a solid bass and dynamics into the Wilsons without sounding glassy and piercing in the midrange, it is likely to sound great with any other speakers
