The CG Ultimate is EXACTLY the same size as the World Models Ultimate ARF. The CG Ultimate is a dog vertically with an OS 90 4 stroke on it no matter how light you build it. The World ARF is a superb performer with a Saito 1.50 4s. The DP planes are too expensive but they do fly extremely well properly set up and powered. The Cermark Pitts flys very well with a Saito 1.50, in case you are interested.

I've been flying bipes of all aerobatic types for many, many years. Power is everything in a biplane due to the extra drag of the second wing and struts. I am not trying to take anything away from any of the models mentioned, just providing some personal experience.