Bitcoin: Bitcoin Core Wallet, Mycelium or Electrum.
Ethereum: Ethereum Wallet or MyEtherWallet (Paper Wallet).
Coinomi. Coinomi supports 64 cryptocurrencies and is one of the best mobile wallets on the market. The only downside is that at the moment it currently works with Android only.
So far, the above Wallet is what I still use until now, it is proven that security can be said to be "very safe". Besides that the usage is also simple