RE: Goldberg Skylark 56 ARF versus Tower Kaos 40 ARF
Just as a point of interest.. the Kaos is a novice pattern/sport aerobatic designed for getting into pattern type competition. The Skylark is a advanced trainer/beginner aerobatic design. The Kaos uses a symetrical airfoil where the Skylark used a Clark Y airfoil which is a high lift type wing. You will be able to fly a Kaos inverted much easier than the Skylark. The Skylark will be more forgiving in the air than the Kaos.
Both are great flyers but you need to look at what type of flying you want to do. Yes they both will loop and roll but the one will do it better and easier than the other.