Undeniably for managing your assets on the erc20 platform, the best wallet is MyEtherWallet. And also Coinomi has a very accessible and simple user interface and 12 words as a secret key. But if you take, for example, the Blokchain .. info wallet, which provides the ability to store Bitcoin and Ethereum, as well as several other highly rated cryptocurrencies, then it suits me due to the high degree of security, which is confirmed by the multi-level possibility of confirming all actions, as well as entering the wallet.