Which wallet do you consider for ERC-20 tokens and how safe is it?
I think, most people trust myetherwallet when it comes to erc-20 tokens. You can also use metamask to store your erc-20 tokens. If you want to secure your altcoin, you must store it in a hard ware wallet.
I agree with you, many people, as I, prefer to use MEW for storing their ERC-20 tokens. Also, it is good idea to buy a hardware wallet, if you have many assets.