What if i don´t care about features supported by Nvidia cards in comparison to AMDs?

Hallo,

i have to buy a GPU for my Blender-Workstation PC now.
If i don´t need now the features (SSS, Volumes…) which are supported currently by NVIDIA-GPUs but not by AMD-cards - would it be better to invest now in a R9 390(X) instead of a GTX 980ti or is overall performance of the 980ti so much better to pay the extra 300.- Dollars?

get the 980ti

Cuda is superior to opencl.