Anything over 44 degrees is worthless for anything but an air brake, you can do any and all 3D as tight as can be with 40 degrees and it still is working like a brake some. There are some people that say more is better, and depending on the airframe you can give too much thinking you want all you can get, it will do everything better with less.
So on your airframe start with about 30 degrees on high rates and then you can adjust more in or less in and see where you want it and where it works the best. On a Yak it usually is about 38, a Sukhoi it is 42 on a Extra it is usually around 37 to 40 and a Edge it is around 30 for 3D throws that the plane performs the best on. Some may like more, I just go for efficiency, I guess that is why there are still aeronautical engineers like me left in the world to figure out efficiency and not just stupid big.