Should I choice Geforce Titan X or 1070 for VFX and 2D MotionGraphic

You cannot really compare the two directly, in this case:

You see, that particular Titan X is of an older GPU architecture than the GTX 1070 - and that particular Titan X comes with all of the idiosyncrasies of the Maxwell generation of GPUs (the same as the GTX 900-series GPUs which use the same technology as the Titan X). In particular, all of the Maxwell-architecture GPUs will severely drop the memory speeds when running CUDA (GPGPU) applications, and are restricted from running their memory any faster than that even if you attempt to overclock the memory! The GTX 1070, on the other hand, is of the (newer) Pascal architecture, and although the memory speed will drop slightly when running CUDA apps, the memory speed will still respond to overclocking unlike Maxwell.