I am not familiar with MyCrypto wallet so I better stick to MyEtherWallet because I know it is still safe but I will keep an eye on both in which of which is the best in terms of features and safety of course. Situational awareness is a key to survive in a possible attack and we are responsible of our own funds safety so I think let us just be extra careful most especially in keeping private keys we have. To be honest even though I am new to erc20 tokens especially wallets like MEW I personally have no experiences regarding security issues with it and I am happy and will continue to use it.