I think the best coin to HODL is still bitcoin ,65% of my money are in bitcoin and the rest on altcoins like ETH and LTC ,gone are the days when you will see 2000% of altcoins ,bullrun has been around for months now and altcoins aren't favouring that much,they will be profitable but not just like 2017 pump
It is one of the best cryptocurrency to invest but for the people who are looking for short term profits there maybe some altcoins which can give huge bumps at the end of bull run but it is not going to be possible for someone to find that coin before its happening.