My point is that why everyone choose Bitcoin there's a lot of top rated coins are available then why people buying Bitcoin most?
people buying Bitcoin most does not mean Bitcoin is the best one. Just because Bitcoin is the first one and most exchanges use Bitcoin as the Based-Coin of exchange pair. It means that if you want to buy other altcoin, you need to buy Bitcoin first .
Now many exchange support USDT pairs, ETH pairs and other Based coin. Bitcoin may be DEAD one day.