The best for Ether will be the HBM2 cards. =)

GridCoin projects still benefit a lot more from NVIDIA. But soon that will change.

AMD is planning... now! In the past, it was trying to just make products get into the market. But now they have understood how to face Intel. Floating point bit-wise-dynamic registers will be something amazing on the new cards. I forsee versatility for mining and ultimately, very good performance in average, over time.