I think best coin with good development and best coin this year is chainlink/ LINK..its still good to buy right now. Other coin thats have potentially 2x or 3 x in this bull season are BCD and BTG.
For me, coins with a good future are the ones that make up the top 20 because there are coins safe to invest in and they can also show a lot of X's. I would say the top 20 are the safest but it does not translate to biggest return. Risk and return are usually proportionate...
I believe in diversified portfolio, which is a mix of mostly safe coins and some smaller risky bets.