Bitcoin is still the king right now and will continue to do so. But I believe a challenger will soon rise above the ashes after we figure out how to resolve and eradicate COVID-19.
Yes bitcoin is the best coin to invest it has high demand and also its best coin since long in the market. In early years people were only ready to invest in bitcoin it was no one coin then someore coins came into being and now again as you said bitcoin is making huge progress as the price is expected to be 10k this year.