Bitcoin is the first one, has the biggest market cap and volume trade per day so it works as a market thermometer.
The market still desperately needs bitcoin as a reference price of all altcoin. Market and bitcoin can not be separated anyhow. as long as bitcoin still has the highest value, so long as bitcoin will remain a benchmark of the price of all altcoin
Right now Bitcoin is like the "Nike" of blockchain and gets all the media attention but these altcoins has a lot more promise than people realize.