I think both are good for investment field, it's just there are some factors that influence enough to choose one of them, if you have high speculation and get a lot of property then I suggest invest in BTC, if you include simple type what is wrong you try to invest in ETH, but do not expect investment to work in the short term, of course you have to prepare mentally to be patient waiting in a long period of time if you want to achieve maximum profit and success.