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.
It's hard to imagine anything better than your own hard drive. Personally, I am a very manic person and I am afraid for the safety of my own funds, which is why I do not trust online wallets, where everything depends on its developers.