Which wallet do you use for storing your ERC-20 token?
I personally like MEW because it's very easy to use. Some people like Trezor or Ledger but personally I have no problems by using MEW

In MEW you have complete access to your private keys.
I prefer to use MyEtherwallet. Ethereum is my favorite cryptocurrency so I try to use tools that are most suitable for ERC-20 tokens. There are a lot of options on the market today. It is possible to make best ever possible choice.