Do you want to hold it at least for 1-2 years or more, then the top 10 cryptocurrencies are a good choice. I mean the top 10 on coinmarketcap. In all cases you should carefully observe your investmentes. Depending on the cryptocurrency value on the current moment I recommend you move contributions from one to another alts. And if you want to inest longterm, then you dont have to check the charts all day, or you will get in panic and make some mistakes with selling to early!