For me, investing all your savings to 3 cryptocurrencies you have mentioned is not really good idea. Why? because you cannot say what will happen the following days or months if the prices will either go up or down. It is very risky and the rates are flactuating. Also, what if something emergency that might happen in few days or months with your own personal life. Be proactive about uncertainties.
it is true what you mention, because if you are not experienced in investing, and the price of bitcoin and altcoin always up and down so as not to have a stable price, you should not be too confident with all this. but if you look at the potential long-term investment is better you choose bitcoin and ethereum.