??? Mr. Bridi designed a lot of planes, the choice is up to you. They pretty much used the same design of wing. The Dirty Birdy has a different design fuse and does a much better knife edge. Last time I covered my Kaos I added to the fin area to get a better knife edge but then it would weather vane more in a cross wind. The DB just flew a bit smoother?? Maybe? My Kaos was also my high wind plane. Other then getting pushed back a little when going vertical wind had no effect on it at all. My Kaos was always with me, when I was having a bad day and couldn't get my thumbs to work the last thing I did was fly the Kaos so I left the field feeling good about myself. The Blue Jay kits are true to the original kits. I did notice some of the kits are now getting laser cut. That would be a good thing. Just don't expect the instructions to hold your hand through the build. These are not someones first build. Does it sound like I'm a big fan of the Bridi designs??