"My Ether Wallet" is a best Ethereum Wallet for token bounty. it is safe for store stoke. Provided that its private key is not shared. Upon receiving the private key information, someone belongs to you. Therefore this caution is important.
Apart from this, there are many other Ethereum Wallets. Coinbase wallet, Metamask Wallet, Tron Wallet, etc, But in my opinion "I "My ether Wallet" this wallet