Me personally I use the German Grafting tool.
It is because I am more comfortable using it than the Chinese tool.
I use the wet graft method so my tool has a small amount of Royal Jelly on it.
I pick up the larva and it floats off my grafting Tool.
I purge each cell cup with royal Jelly with a syringe before grafting.
But as far as one tool over the other, it depends on what you are comfortable working with.
Me I feel I have more control using the small end of the German Grafting Tool.
Both are good.