Best ones always will be btc & eth.But if you concern about your privacy you should check privacy coins like Veil,Daps,Stakenet,Loki etc.They allow to stake and make transactions anoymously with their nice privacy technologies which eth & btc lack of this kind of privacy features.
Depends on what you want from a privacy coin? POW/POS,Ringct,Anonymous Staking,Masternode ROI etc all has different features Check masternospro for best ones.Currently using Energi,Loki,Veil,Daps & all include nice privacy techs.
Bitcoin & etherum always will be the best choice for no risk & best to keep money . Also some altcoins like daps,veil have privacy features currently my preferred choices atm.