There's several criteria to select a good validator. This includes the commission they take, their uptime, their support (is it easy to be in contact with them?) etc. The APY is the same for every validator. We have a dedicated channel for all things staking where you will find lots of information, can ask questions about staking and there are also validators advertising: https://t.me/casperblockchainstaking
Speedyxv is good one
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