Either the two of this you can invest because ETH was only following the price movement of BTC but I trust bitcoin, bitcoin is unlimited if bitcoin back on his price all crypto world will return too.
actually not following the price of btc. ethereum and all altcoins are tied to market movements. when the market moves it certainly also affects the altcoin prices that exist. while the market movement is one of them caused by the rise and fall of bitcoin prices. if I choose investment I think bitcoin and ethereum are the right choice, there is no one to choose, choose both.