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.
MEW is the most user friendly wallet for ethereum that I have encounter. They give best usability and most comprehend to ensure even a people that has no knowledge yet on MEW wallet be able to use it with no problem.