I think it is good to buy bitcoin as a first option, if the intention is investment, which leads or waits wait time for the bitcoin to rise and be placed in bullish trend or at its best when bitcoin reaches the distribution phase, if the investor is determined to wait as long as necessary until reaching that stage is ideal.

On the other hand ETH is a great investment, if there is money to put it in Bitcoin and ETH is a great move because it is taking advantage of having the two best coins in crypto, also has an advantage that ETH has a lot of development in projects ICOS, STO, IEO, which brings good support to the additional currency, taking into account that ETH is totally what bitcoin does, that is, ETH has a structure similar to that of bitcoin, if bitcoin low ETH too, if Bitcoin Up, the first Altcoin that goes up may be ETH.

Now if you want is to decide on one of the two, in my case I would go for the best, for me it is still bitcoin, after that any investment decision is to what the investor's sense indicates or what he likes to do with your money.