Staking in well-known coins does really have certainty, however, the more popular the coin is the more user will stake in it and as it takes more it will make lower the APR. And in that case, it is been more recommended to store your coins in your wallet rather than to stake in a coin that has a lower APR. Personally, I am staking on TRON and ALGO and they kinda seem good to me they are not like other random coins that can be staked. ETH will be good as well though many users are going to stake, however.