TBH I would advise stick to top 20 coins, Cardano is my opinion will be a sure thing come the bull run, likewise will be Neo, these are huge space to grow in this area so I would choose these
I have more than 2 favorites that I think are the best altcoins for investment. These are Ontology, Credits, OmiseGO, IOTA, TRON, Gladius, EIDOO, and Stellar.