I have built and flown both the T-6G and the SBD. Both fly very well, Joe Gilbert has won a ton of meets with the T-6 and fooled a lot of folks who think it couldn't possibly fly well. I have done ok with the SBD. If I would work at it I would do even better. The T-6 has over a thousand flights on it and still looks good after ~11 years! The SBD a lot less but still looks good for a ~10 year old airplane! As for which warbird would be the best flyer, in my opinion, they are all the same airplane, ~500 sq in and ~21% tail, they just look a little different. The real killer in my opinion would be the T-34C as it has a tricycle gear and a longer nose so less lead needed up front. The real airplanes all had heavy engines on a short nose and since my warbirds are very close to scale, I need some lead in the nose. They come out about 48 oz which doesn't seem to bother them at all. Check this Elwyn Aud photo.