There are a lot staking coins. I have familiar with only 4 staking coins that i am staking till now.
My four best staking coins are-
Ethereum
Cardano (ADA)
Tron (TRX)
Polka Dot (DOT)

Here obviously, ethereum is the best staking coin as already ethereum 2.0 beacon chain started. It is the first choice for staking. ADA is my 2nd best choice  for staking. It is so simple for staking in ADA wallet and also TRX is very easy to stake and earn  passive while we sleep.