There are many types of altcoins, but I don't think that all altcoins grow well, good and strong altcoins. I can give examples, for example ethereum, neo, eos, these three altcoins are good development, you can invest in all three coins.
the coins that you mentioned are indeed the best Altcoins have a strong foundation so they can survive and grow well. Today many coins fall so that not only are some bad Altcoins, but almost everything is bad. so in my opinion this is the right time to buy Ethereum, NEO and EOS, I'm sure this coin will grow and rise high and you will get big profits in the future.