You never know that is the catch. POS is great don't get me wrong but if everybody knew which coin will be best well guess what it's price would be already high. It doesn't matter if you can earn passively or not what matter is your profit. Sometimes it will pay off to have even pow coin and if it's price shoots up ypu could earn more than from staking. You might want to look at the ethereum as they seem to be one of the most well know out there and are also looking into developing their coin to be pos