Bitcoin is likened to the parent of Altcoin, so even though it's not all, when bitcoin rises, the altcoin average will also increase the price.
I will try to research deeper about Ethereum, Ripple, and Eos before choosing the option to invest.
Of course, compared to other coins, ethereum is more relevant for investment. But I advise everyone to look at the stellar, which showed quite good results despite the poor state of the 2018 market.