I will advice you not to use one wallet to store all your crypto asset, it's risky to do that because if anything happens to the wallet, you will lose everything you have worked for, the thing you can do is to use different wallets to hold different coins, you can use MEW to hold your erc20 tokens and blockchain.info wallet for your bitcoin that way, you will rest assured that if anything happens to one wallet, you still have other ones.
I would not recommend that. He could feel safer with those coins if he had more than one wallet.