This ranking is an update as of December 22, 2021 based on their market capacity
The same ranking are posted in Marketcap.com and coingecko, I listed here the top 10:
Rank 1: Bitcoin
Rank 2: Ethereum
Rank 3: Binance Coin
Rank 4: Tether
Rank 5: Solana
Rank 6: XRP
Rank 7: Cardano
Rank 8: USD Coin
Rank 9: Terra
Rank 10: Avalanche
Everyone can see that on those websites. A few months ago, there goes the Dogecoin and Shiba on the top 10 IIRC and now they're gone. But they're still part of the top 15.
Many people prefer stability. Bitcoin has a limited issue and the demand in Bitcoin continues to grow.
That is why people prefer to buy bitcoin and use it for investment purposes.
Yes, no doubt that bitcoin will remain to be the most popular cryptocurrency not just for this year but also for the next years. That's why if you still don't any of it even a little amount, you have to have it.