Bitcoin is king and financial institutions have high expectations on it, the most conservative thinks it will get to 50k this year, pum! it surpasses that already. Others believe it can get between 150k to 350k, that is crazy!
On the other hand, I do prefer Ethereum (ETH) as it is made on blockchains which have tons of applications and pros comparing to BTC. Since the end of December, last year to this day has over a 150% ROI.
The net has its favorites for 2021, it includes Cardano, Chainlink, Monero between others.
Personally, I do not like XRP as it has too many legal issues so it makes it less liquid.