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 always choose MEW to store ERC-20 Token because this wallet will support all of Token. Trezor and Ledger are best for famous crypto like BTC, ETH, EOS, XRP, BCH. So that if you only need to store Token from ICO projects, MEW e-wallet is highly recommended because of the high security.