Ease of use wallets are an advantage, a bonus. A user-friendly interface is your comfort while holding your cryptocurrencies. It is always good but it shouldn't be a factor since it doesn't matter how comfortable the t-shirt is, if it's ugly then it's ugly. And if it's not safe then it's not safe, and that's a must thing. Therefore, you need to ask yourself for the right things in a wallet. So the obvious thing is that your wallet needs to be an open source, fully transparent to the users; if they show you their heart then you can feel safe. Now, the real things you should be looking for are the backup & security; a user should have full control of his private key, the privates' keys mustn't be stored on any database or anything like that from the client side. You are the owner of yourself and no one else is.
In conclusion, I want to introduce you my favourite wallet - Trust Wallet App. Compatible with Ethereum and ERC20 tokens, as I mentioned the ease of use means a user-friendly interface is a bonus and indeed is coming along wallet. But more than everything, this is an open source wallet and everything it's in front your eyes; no database or information is stored. There many other advantages that I would like to mention, but I believe the link I'll share with you is pretty much-explaining everything.
Why choose Trust Wallet? What is Trust Wallet?
Click here
make two or three wallets to store them. and always sync it with google authenticator to ensure the safety of wallet account
I recommend blockchain, indodax