Any reason or you have to much miney and time to do it for fun?
The transmission fluid is used for lubricating the transmission parts and provide shifting power. If the fluid is good, no need to change. The color and smell of the fluid can tell you the need of changing.
I have a car brought from new and it has 130k miles on it now, I never change its transmission fluid.
If you are not experienced, change the fluid as the owner's manual said, absolutely no need to change it every year.