Myetherwallet is a wallet that is practical for use. even I use the wallet until this time. Despite the many complaints that said wallet is full of hackers then this will be dependent on yourself if saving the private key safely or not. many of the coins that use platforms from ethereum and that is one reason why this practical and widely used.
I find private keys and JSON files to access wallets on MEW are always recommended not a good way to access wallet. But to the present my wallet has not been affected by any hacker, I think no matter what you use it is important how you protect them.