From BTC and ETH , I will choose ETH.
ETH is more stabled. and BTC now its just... bad.. I guess.
Maybe in the future I will invest on BTC , will see. But now I have an investment placed on ETH.
I have both but from technological side I'm for ETH. BTC will have its place again as a crypto king but I'm not sure if this will happen in 2018. Probably lightning network and ease of regulations will push a new upwards momentum. Crash possibility is legitimate as well. You should protect yourself.
Currently, the price of Bitcoin or Ethereum are dumping by the FUD. But, I don't sell my coin and I'm sure will never sell at this FUD. It's unreasonable and just by some problem from the Chinese government enough to make the price of all cryptocurrency dump to the hell.