I've flown both, I have the Katana, my buddy has the Fusion. The Fusion is a much better flying plane. It tracks cleanly, and can do all the precision stuff, while still doing 3d as well as the Katana. Heck, go into the Katana thread in the OMP forum and there's a post by MIke Pilkerton (the designer) where he tells me not to fly my friend's Fusion, because it's a better plane. He's right, it is a better plane.