It really depends from coin to coin. You should do you due diligence on the coins you invest in - the team behind them,the product itself (is it needed,will it be used in 5-10 years,whats the competition). We, at Staking.com, recommend PoS coins, because in our opinion they will replace the PoW coins and most of them will transition to PoS (just as Ethereum is doing right now). In addition to that its a lot easier to stake than it is to mine and it doesn't requier expensive miners and high electricity bills.