Which wallet is good to store ERC 20 tokens for long time?
Desktop or Android based?
MEW or mytherwallet you can make as ERC 20 wallet, you can save it in a long time, and easy to use in android.
bounty very much rely on MEW to be a suitable address
Mew is good for erc20 tokens but lack of security, lots of phishing attempts, you always have to look at link, if you want more security I would suggest you to use trezor wallet as highest security wallet.