Not sure if this has been asked.
I am a canon user and a new DSLR user. A nikon teacher mentioned that nikon has 3D tracking and implied (or i read it as imply) that this is the reason to get nikon.
What is the pro and con of 3D tracking? is it fast, accurate and necessary?
Does canon has similar function/capability? Or is there any technic (like panning?) to achieve the same result?