If you want to buy a coin and hold for long term then it is good to buy now but for short term, I don't think so because we are already on high price, possible it may go down. Well the best coin to invest are ethereum and binance coin. 
Why is there no Bitcoin? Bitcoin is the best cryptocurrency in this market and we should invest in it. I invest over 70% in bitcoin and the rest is spent on the top 10 altcoins in this marketDefinitely bitcoin is not left out Bitcoin will definitely be in your portfolio. I’m just talking about the top 5 altcoins I’ll be adding to my portfolio now