The most suitable coin for investment in the future is Bitcoin. In the next bull market, Ethereum may not return to a very high price. The current abuse of ICO has affected the growth of Ethereum. So I recommend buying Bitcoin.
In normal times, when there are no such strong price collapses and with an eye on the long term, I would buy bitcoin, but now it will be most profitable to buy Ethereum, updates will soon happen and will give a boost to growth