Which do you learn? Maya, 3ds Max, or Blender?

Depends on what exactly you wanna do.

If you just wanna do hobby game everything, modeling, rigging, animation, blablabla. Then it doesnt really matter. Save some money, do blender, whatever.
If you wanna go pro and land a job at some larger studio some day, take Maya.

In the end the quesiton is also: